Q. What star at the center of the solar system makes its own light and heat?
Options: Sunspot · The Sun · A star · Solar eclipse
Answer: The Sun
The Sun is a star that shines on its own, sending light and heat to Earth.
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Planets, weather, rocks, and landforms — answers and explanations for all 200 questions. Cover the answer, have a guess first, then check the explanation. Want to play it as a quiz? Try it at the Quiz Playground!
Q. What looks biggest and brightest in the night sky?
Options: The Moon · A rainbow · A star · A shooting star
Answer: The Moon
The Moon is Earth's one and only satellite.
Q. What hot star shines in the sky during the day?
Options: Earth · The Moon · The Sun · A star
Answer: The Sun
The Sun is the star that gives Earth light and heat.
Q. What is the name of the planet we live on?
Options: The Moon · Venus · Mars · Earth
Answer: Earth
Earth is the blue planet with water and life.
Q. Which planet is called the 'Red Planet'?
Options: Saturn · Venus · Jupiter · Mars
Answer: Mars
Mars looks red because of its rusty red soil.
Q. How many colors is a rainbow usually split into?
Options: 10 · 3 · 7 · 5
Answer: 7
Red, orange, yellow, green, blue, indigo, violet — 7 colors!
Q. What is the biggest planet in the solar system?
Options: Saturn · Uranus · Jupiter · Earth
Answer: Jupiter
Jupiter is so big that 1,300 Earths could fit inside.
Q. Which planet is famous for its beautiful rings?
Options: Mars · Saturn · Earth · Mercury
Answer: Saturn
Saturn's rings are made of ice and chunks of rock.
Q. At what temperature does water boil?
Options: 0°C · 100°C · 36.5°C · 50°C
Answer: 100°C
Water boils at 100°C and freezes at 0°C.
Q. How many planets orbit the Sun in all?
Options: 5 · 12 · 9 · 8
Answer: 8
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune — 8!
Q. Which planet is closest to the Sun?
Options: Neptune · Earth · Mercury · Jupiter
Answer: Mercury
Mercury, the innermost planet!
Q. Which planet is farthest from the Sun?
Options: Mercury · Neptune · Earth · Mars
Answer: Neptune
Neptune, way out on the edge!
Q. Which number planet from the Sun is Earth?
Options: Third · Fifth · Eighth · First
Answer: Third
Mercury, Venus, Earth — the third!
Q. What blazing thing sits at the center of the solar system?
Options: Earth · The Sun · The Moon · Jupiter
Answer: The Sun
The Sun — a star that shines on its own!
Q. What do we call an object that shines by itself, like the Sun?
Options: A satellite · A star · A planet · A comet
Answer: A star
Most stars in the night sky are suns like ours!
Q. What kind of object orbits a star like the Sun, as Earth does?
Options: A planet · A galaxy · A satellite · A star
Answer: A planet
A planet doesn't make its own light — it orbits the Sun!
Q. What kind of object orbits a planet, like the Moon?
Options: A planet · A comet · A star · A satellite
Answer: A satellite
Earth's satellite is the Moon!
Q. What is Earth's satellite?
Options: Mars · The Sun · The Moon · Jupiter
Answer: The Moon
The one and only Moon that orbits Earth!
Q. Which planet is called the 'Red Planet'?
Options: Jupiter · Mars · Saturn · Venus
Answer: Mars
Mars, with its rusty red soil!
Q. Which planet is famous for its beautiful rings?
Options: Earth · Saturn · Mercury · Mars
Answer: Saturn
Saturn's rings of ice and rock!
Q. Which planet is called 'Earth's twin' because it's a similar size?
Options: Jupiter · Saturn · Mars · Venus
Answer: Venus
Venus, shining bright in the night sky!
Q. Why do we send robot rovers to Mars?
Options: To sightsee · To look for signs of life and water · To farm · To dump trash
Answer: To look for signs of life and water
We explore to see if life ever existed on Mars!
Q. What do we call the band of small rocks between Mars and Jupiter?
Options: The asteroid belt · The Milky Way · The aurora · A black hole
Answer: The asteroid belt
A belt where lots of small asteroids gather!
Q. What icy, dusty object orbits the Sun with a long tail?
Options: The Moon · A planet · A constellation · A comet
Answer: A comet
Halley's Comet is a famous one!
Q. What is a 'shooting star' streaking across the night sky, really?
Options: A satellite · Space dust burning up in the air (a meteor) · Lightning · A real star
Answer: Space dust burning up in the air (a meteor)
Small rocks and dust glow as they burn up!
Q. Why do we have day and night?
Options: Earth spins on its own (rotation) · The Sun moves · The Moon grows · Because of clouds
Answer: Earth spins on its own (rotation)
Earth spins around once a day!
Q. How long does it take Earth to spin around once?
Options: A month · An hour · A day (about 24 hours) · A year
Answer: A day (about 24 hours)
One rotation is about 24 hours!
Q. What do we call Earth traveling once around the Sun?
Options: Stopping · Revolution (orbiting) · Spinning · Rotation
Answer: Revolution (orbiting)
Orbiting around the Sun is revolution!
Q. How long does it take Earth to travel once around the Sun?
Options: A year (about 365 days) · A week · A month · A day
Answer: A year (about 365 days)
One orbit takes about 1 year!
Q. Why do we have spring, summer, fall, and winter?
Options: The Moon changes · Because of wind · Because of clouds · Earth is tilted as it orbits the Sun
Answer: Earth is tilted as it orbits the Sun
Earth's tilted axis makes the seasons change!
Q. In which direction does the Sun rise?
Options: West · North · South · East
Answer: East
The Sun rises in the east!
Q. In which direction does the Sun set?
Options: North · West · East · South
Answer: West
The Sun sets in the west!
Q. How long does the Moon take to go from crescent to full to old moon?
Options: A week · A year · A day · About a month
Answer: About a month
The Moon cycles through its shapes about every 30 days!
Q. What shape is a full moon?
Options: An eyebrow shape · A square · A round shape · A half shape
Answer: A round shape
A nice round full moon!
Q. Can you sometimes see the Moon in the daytime sky?
Options: No · Yes
Answer: Yes
You can see a daytime moon too!
Q. What is it called when the Moon covers the Sun and day goes dark?
Options: A rainbow · An aurora · A lunar eclipse · A solar eclipse
Answer: A solar eclipse
A solar eclipse — the Sun disappears!
Q. What is it called when Earth's shadow covers the Moon?
Options: Sunrise · A lunar eclipse · A solar eclipse · Sunset glow
Answer: A lunar eclipse
A lunar eclipse — the Moon turns red!
Q. Why do footprints last so long on the Moon?
Options: Lots of people are there · It rains often · The soil is special · There's no wind or water
Answer: There's no wind or water
With no air or water, the Moon's marks never wash away!
Q. What happens to your weight on the Moon compared to Earth?
Options: It becomes zero · It stays the same · It gets heavier · It gets lighter (about 1/6)
Answer: It gets lighter (about 1/6)
Weaker gravity lets you bounce around!
Q. What is it called when the sea rises and falls about twice a day?
Options: A flood · Tides · A tsunami · Waves
Answer: Tides
Mostly caused by the Moon's pull!
Q. What do we call it when we connect stars into imagined shapes?
Options: A rainbow · A constellation · A comet · A galaxy
Answer: A constellation
Constellations like the Big Dipper and Orion!
Q. Which almost-still star in the northern sky shows direction?
Options: Venus · The North Star · The Sun · Mars
Answer: The North Star
The North Star guided sailors long ago!
Q. What seven stars are famous for their dipper shape?
Options: Orion · The Big Dipper · The Milky Way · Cassiopeia
Answer: The Big Dipper
The Big Dipper, shaped like a ladle!
Q. What hazy river of stars flows across a clear night sky?
Options: A rainbow · Clouds · The Milky Way · An aurora
Answer: The Milky Way
The Milky Way — countless stars together!
Q. What do we call a giant group of countless stars?
Options: A galaxy · A planet · A comet · A constellation
Answer: A galaxy
We live in the Milky Way galaxy!
Q. What object has gravity so strong even light can't escape?
Options: A constellation · A comet · A black hole · A rainbow
Answer: A black hole
A black hole swallows everything!
Q. Why do stars appear to twinkle?
Options: The air wobbles · Because of clouds · The stars move · The stars blink
Answer: The air wobbles
Earth's air shakes the starlight!
Q. What is space filled with?
Options: Water · Air · Soil · Mostly empty space and objects
Answer: Mostly empty space and objects
Space is mostly a vacuum!
Q. Why doesn't sound travel in space?
Options: It's too bright · There's no air · It's too wide · It's too cold
Answer: There's no air
There's no air to carry the sound!
Q. What covers the largest part of Earth's surface?
Options: Land · Deserts · The ocean · Forests
Answer: The ocean
About 70% of Earth is ocean!
Q. What do we call the layer of air that surrounds and protects Earth?
Options: Clouds · The atmosphere (air) · The ocean · A rainbow
Answer: The atmosphere (air)
The atmosphere protects us!
Q. What color does Earth look from space?
Options: Yellow · Green · Blue (water and air) · Red
Answer: Blue (water and air)
Earth, the 'blue planet'!
Q. What does seawater taste like?
Options: Like nothing · Sour · Sweet · Salty
Answer: Salty
It's salty from dissolved salt!
Q. What do we call water traveling between the sky and the ground on Earth?
Options: A flood · Splashing · A drought · The water cycle
Answer: The water cycle
Evaporate → clouds → rain → rivers → sea!
Q. Seawater evaporates and rises into the sky to become what?
Options: Clouds · Lightning · A rainbow · Wind
Answer: Clouds
Water vapor gathers into clouds!
Q. What falls when droplets in a cloud get heavy?
Options: Clouds · Wind · A rainbow · Rain
Answer: Rain
They fall as raindrops!
Q. What falls from the sky in very cold places or in winter?
Options: Snow · Fog · Dew · Rain
Answer: Snow
It freezes into snowflakes!
Q. What do we call water that flows or collects underground?
Options: Tap water · Groundwater · Rainwater · Seawater
Answer: Groundwater
Groundwater beneath our feet!
Q. What tells us today's weather ahead of time?
Options: A calendar · A map · A clock · The weather forecast
Answer: The weather forecast
The weather service's forecast!
Q. Why does wind blow?
Options: Clouds push it · Air moves · Earth shakes · Birds fly
Answer: Air moves
When air moves, wind blows!
Q. What big thing brings heavy rain and wind in summer?
Options: A typhoon (hurricane) · Dew · A rainbow · Frost
Answer: A typhoon (hurricane)
A swirling, spinning storm!
Q. What rumbling sound comes after lightning?
Options: Wind · An echo · Thunder · Rain sounds
Answer: Thunder
Thunder is the sound of lightning!
Q. Which comes first — the flash of lightning or the sound of thunder?
Options: Lightning (light) · Thunder (sound) · At the same time · Thunder always first
Answer: Lightning (light)
Light is faster than sound, so you see lightning first!
Q. What rain pours down suddenly on a summer afternoon and then stops?
Options: Drizzle · A shower · A rainy season · Mist
Answer: A shower
A quick, pouring shower!
Q. What summer weather brings rain for many days in a row?
Options: A shower · A typhoon · A rainy season · A drought
Answer: A rainy season
A rainy season! It happens when the boundary between cold and warm air lingers, dropping rain.
Q. What tiny droplets form on grass at dawn?
Options: Frost · Dew · Snow · Rain
Answer: Dew
Dew condensed overnight!
Q. What white stuff freezes onto things on a cold morning?
Options: Frost · Dew · Snow · Fog
Answer: Frost
Frost — frozen water vapor!
Q. What hazy stuff near the ground makes it hard to see ahead?
Options: Sunset glow · Clouds · Fog · A rainbow
Answer: Fog
Low-lying water droplets — fog!
Q. What seven-colored thing appears in the sky after rain?
Options: Lightning · The Milky Way · Sunset glow · A rainbow
Answer: A rainbow
Light splits in the droplets to make a rainbow!
Q. How many seasons does a temperate country like Korea have?
Options: 4 · 6 · 2 · 12
Answer: 4
Spring, summer, fall, and winter — four seasons!
Q. Which season has the longest days and shortest nights?
Options: Fall · Winter · Spring · Summer
Answer: Summer
Summer, when the Sun stays up long!
Q. Which season has the longest nights and shortest days?
Options: Winter · Fall · Summer · Spring
Answer: Winter
Winter, when daylight is short!
Q. What do we call the hot material that flows out from deep underground?
Options: Rainwater · Ice · Lava (magma) · Sand
Answer: Lava (magma)
Hot lava pouring from a volcano!
Q. What do we call a mountain where magma bursts out?
Options: A sand hill · A volcano · A hill · An iceberg
Answer: A volcano
Rumble! A volcanic eruption!
Q. What is it called when the ground suddenly shakes?
Options: An earthquake · A drought · A flood · A typhoon
Answer: An earthquake
An earthquake shakes from movement underground!
Q. What's the safe thing to do in an earthquake?
Options: Stand by the window · Get under a desk · Take the elevator · Run around
Answer: Get under a desk
Protect your head and get under something sturdy!
Q. What do we call giant waves caused by an undersea earthquake?
Options: Sunset glow · A tsunami · Dew · A rainbow
Answer: A tsunami
A terrifying tsunami rolling in!
Q. What do we call a river carving away the land over a long time?
Options: Deposition · An earthquake · A volcano · Erosion
Answer: Erosion
Water carves the land into valleys!
Q. What do we call soil and sand carried by a river piling up?
Options: Explosion · Erosion · Deposition · Evaporation
Answer: Deposition
It piles up to make wide plains!
Q. What striped rock is made from layers built up over ages?
Options: Sand · Glacier · Volcano · Sedimentary rock
Answer: Sedimentary rock
Layers harden into sedimentary rock!
Q. What do we call the body or trace of an ancient creature left in stone?
Options: Trash · A fossil · A gem · Ice
Answer: A fossil
Dinosaur fossils tell us about long ago!
Q. What can we learn from dinosaur fossils?
Options: Creatures that lived long ago · Future weather · Tomorrow's news · The size of the universe
Answer: Creatures that lived long ago
A fossil is a letter from the past!
Q. What is dug from the ground to fuel cars and planes?
Options: Sand · Air · Oil · Water
Answer: Oil
Oil, made from ancient living things!
Q. What do we call fuels like oil and coal, made from long-buried life?
Options: Fossil fuels · Wind fuels · Solar fuels · Water fuels
Answer: Fossil fuels
Coal, oil, and natural gas are fossil fuels!
Q. What do we call the problem of Earth getting hotter and hotter?
Options: Rainy season · Ice age · Global warming · Dust storms
Answer: Global warming
The climate crisis — let's stop it together!
Q. What's a big cause of global warming?
Options: Too many trees · More greenhouse gases like carbon dioxide · Too much rain · Too many stars
Answer: More greenhouse gases like carbon dioxide
Smoke and car exhaust are causes!
Q. Which is NOT a way to protect the Earth?
Options: Save electricity · Plant trees · Use lots of disposable items · Recycle
Answer: Use lots of disposable items
We should use fewer disposables!
Q. Which layer of Earth blocks harmful rays (UV) from the Sun?
Options: Clouds · Forests · The ozone layer · The ocean
Answer: The ozone layer
High in the sky, the ozone layer protects us!
Q. What yellow sand dust blows in from deserts in spring?
Options: Frost · Clouds · A dust storm · Fog
Answer: A dust storm
Dust storms mean it's time for a mask!
Q. What's a good thing to do on a very dusty day?
Options: Breathe deeply · Wear a mask · Play outside a long time · Open all the windows
Answer: Wear a mask
A mask protects your lungs!
Q. What do you need to see the night sky's stars up close?
Options: A telescope · A microscope · A thermometer · A magnifying glass
Answer: A telescope
A telescope for seeing far away!
Q. What do we call a person who travels beyond Earth into space?
Options: A diver · An explorer · A captain · An astronaut
Answer: An astronaut
An astronaut in a space suit!
Q. What orbits Earth to help with communication and weather?
Options: A drone · An airplane · A hot-air balloon · A satellite
Answer: A satellite
A satellite! It falls toward Earth while racing sideways so fast that it keeps circling instead of landing.
Q. What is the name of South Korea's homegrown space rocket?
Options: Voyager · Nuri · Sputnik · Apollo
Answer: Nuri
The Nuri rocket, built with Korean technology!
Q. In what year did humans first set foot on the Moon?
Options: 2000 · 2020 · 1969 · 1900
Answer: 1969
Apollo 11, in 1969!
Q. Which of these shines with its own light?
Options: The Moon · The Sun (a star) · Earth · Mars
Answer: The Sun (a star)
The Moon and planets only reflect the Sun's light!
Q. Why does the Moon look bright?
Options: It reflects the Sun's light · It has lamps · It shines by itself · It's on fire
Answer: It reflects the Sun's light
The Moon reflects sunlight like a mirror!
Q. Which is the correct order of planets (closest to the Sun first)?
Options: Mars-Earth-Venus-Mercury · Mercury-Venus-Earth-Mars · Earth-Moon-Sun-Mars · Jupiter-Saturn-Earth-Mercury
Answer: Mercury-Venus-Earth-Mars
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune!
Q. Which statement about Earth is WRONG?
Options: It has air · It shines by itself · Living things live on it · It has water
Answer: It shines by itself
Earth only receives the Sun's light — it doesn't shine on its own!
Q. What makes Earth's day 24 hours long?
Options: Earth's orbit · Earth's rotation · The Sun's size · The Moon's shape
Answer: Earth's rotation
One spin equals one day!
Q. What shape is the Earth we live on?
Options: A triangle · A flat plate · A square · A round ball
Answer: A round ball
Earth is a round sphere!
Q. What star at the center of the solar system makes its own light and heat?
Options: Sunspot · The Sun · A star · Solar eclipse
Answer: The Sun
The Sun is a star that shines on its own, sending light and heat to Earth.
Q. What is this small planet, the closest one to the Sun?
Options: Uranus · Mercury · Saturn · Mars
Answer: Mercury
Mercury is the planet closest to the Sun, and its surface is full of craters.
Q. What planet is called 'Earth's twin' for its similar size?
Options: Saturn · Venus · The Sun · Earth
Answer: Venus
Venus is wrapped in thick clouds, making it the hottest planet in the solar system.
Q. What is this planet we live on, with water and life?
Options: Jupiter · Venus · The Sun · Earth
Answer: Earth
Earth has water and air, making it the only planet we know with life.
Q. What planet looks red and is called the 'Red Planet'?
Options: Venus · Uranus · Mars · Saturn
Answer: Mars
Mars looks red because of the rusty soil on its surface — hence the 'Red Planet'.
Q. What is this striped planet, the biggest in the solar system?
Options: Mars · Uranus · Jupiter · Saturn
Answer: Jupiter
Jupiter is the biggest planet, with a huge storm called the Great Red Spot.
Q. What planet is famous for its beautiful rings?
Options: Saturn · The Sun · Mars · Jupiter
Answer: Saturn
Saturn wears magnificent rings made of ice and rock.
Q. What is this blue-green planet that rolls on its side?
Options: Earth · Venus · Uranus · Jupiter
Answer: Uranus
Uranus orbits the Sun tipped on its side and glows blue-green.
Q. What is this blue planet, the farthest from the Sun?
Options: Venus · Neptune · Earth · Mercury
Answer: Neptune
Neptune is the farthest planet from the Sun and is a deep blue.
Q. What was once a planet but is now called a dwarf planet?
Options: Pluto · Uranus · The Moon · Neptune
Answer: Pluto
Pluto is small, so it's now classified as a 'dwarf planet'.
Q. What satellite orbits Earth in the night sky?
Options: Lunar eclipse · The Moon · Full moon · Old moon
Answer: The Moon
The Moon is Earth's satellite. It doesn't shine on its own — it reflects sunlight.
Q. What is this round, completely full moon?
Options: Full moon · Solar eclipse · Old moon · Crescent moon
Answer: Full moon
When the Moon faces the Sun's light head-on and looks round, we call it a full moon.
Q. What is this moon, thin as an eyebrow?
Options: A star · Crescent moon · A comet · Half moon
Answer: Crescent moon
A crescent moon is when only a sliver of the Moon catches the sunlight.
Q. What are these round pits on the Moon made by meteorites?
Options: Moon craters · Canyons · Caves · Volcanoes
Answer: Moon craters
The Moon's craters are the dents left where meteorites crashed into it.
Q. What is it called when the Moon covers the Sun and day turns dark?
Options: Sunset glow · Sunspot · Solar eclipse · Aurora
Answer: Solar eclipse
A solar eclipse is when the Moon blocks the Sun and it goes dark in the daytime.
Q. What is it called when Earth's shadow makes the Moon look red?
Options: Sunset glow · Aurora · Solar eclipse · Lunar eclipse
Answer: Lunar eclipse
A lunar eclipse is when Earth's shadow covers the Moon, turning it red.
Q. What is this, leaping like flame from the Sun's surface?
Options: Solar prominence · Corona · Aurora · Lava
Answer: Solar prominence
A prominence is hot gas leaping up from the Sun's surface like a flame.
Q. What is this swirl of countless stars gathered together?
Options: A comet · The Milky Way band · A constellation · A galaxy
Answer: A galaxy
A galaxy is a giant group of hundreds of billions of stars.
Q. What is this hazy band of stars, like a river in the night sky?
Options: A galaxy · Clouds · The Milky Way · The night sky
Answer: The Milky Way
The Milky Way is our own galaxy's stars seen as a band across the sky.
Q. What is this cloud of gas and dust gathered in space?
Options: Star cluster · The Milky Way · Black hole · Nebula
Answer: Nebula
A nebula is a cloud of gas and dust where stars are born.
Q. What is this tight ball of countless stars?
Options: The night sky · Black hole · Star cluster · Galaxy
Answer: Star cluster
A star cluster is a group of stars packed tightly together.
Q. What is this mysterious object that swallows even light and looks black?
Options: A planet · A star · A black hole · A galaxy
Answer: A black hole
A black hole's gravity is so strong that not even light can escape.
Q. What icy, dusty object orbits the Sun trailing a long tail?
Options: A satellite · A comet · The Moon · A shooting star
Answer: A comet
A comet is made of ice and dust, and grows a long tail as it nears the Sun.
Q. What small rocky objects gather between Mars and Jupiter?
Options: Asteroids · Comets · Satellites · Shooting stars
Answer: Asteroids
Asteroids are small rocky objects orbiting the Sun, mostly between Mars and Jupiter.
Q. What is this streak of light falling across the night sky?
Options: A meteorite · A shooting star · A comet · Lightning
Answer: A shooting star
A shooting star (meteor) is space dust glowing as it burns up against the air.
Q. What do we call a rock from space that lands on the ground?
Options: A mineral · A stone · An asteroid · A meteorite
Answer: A meteorite
A meteorite is a space rock that didn't burn up and reached the ground.
Q. What is this giant pit made by a big meteorite hitting the ground?
Options: A valley · A cave · A moon crater · An impact crater
Answer: An impact crater
An impact crater is a huge dent where a big meteorite struck the ground.
Q. What is this green light rippling like a curtain in polar skies?
Options: The Milky Way · Sunset glow · The aurora · Solar prominence
Answer: The aurora
The aurora happens when particles from the Sun glow in the polar sky.
Q. What is it called when stars are connected into animal or object shapes?
Options: Star trails · A constellation · The aurora · A star cluster
Answer: A constellation
A constellation is stars connected into a shape and given a name.
Q. What is this sky, filled with sparkling stars?
Options: The night sky · Star trails · The aurora · The Milky Way
Answer: The night sky
On a clear night, countless stars twinkle in the night sky.
Q. What is this photo where a long exposure made stars trace circles?
Options: The Milky Way · The night sky · Star trails · Lightning
Answer: Star trails
Because Earth spins, a long photo of the stars leaves circular trails.
Q. What is this view of Earth rising, seen from the Moon?
Options: Earthrise · Earth · Sunset glow · The Moon
Answer: Earthrise
Earthrise is the famous view of Earth rising, photographed from a spacecraft at the Moon.
Q. What is this, blasting fire as it flies into space?
Options: A rocket · An astronaut · A telescope · A probe
Answer: A rocket
A rocket burns fuel and uses the blast to fly all the way to space.
Q. What spacecraft travels between space and Earth and is reused many times?
Options: Space station · Space shuttle · Satellite · Rocket
Answer: Space shuttle
The space shuttle lands like an airplane after a space trip and flies again.
Q. What orbits Earth to help with communication and weather?
Options: The Moon · A spaceship · A star · A satellite
Answer: A satellite
Satellites circle Earth, helping with broadcasting, phone calls, and weather watching.
Q. What is this big facility orbiting Earth where astronauts live and experiment?
Options: A rocket · A space station · A satellite · A telescope
Answer: A space station
The International Space Station (ISS) is where astronauts live and run experiments.
Q. Who is this person working in space in a space suit?
Options: A diver · A soldier · An astronaut · A pilot
Answer: An astronaut
Astronauts wear special suits to carry out missions in space.
Q. What is it called when an astronaut works outside the spacecraft?
Options: Flying · Diving · Climbing · A spacewalk
Answer: A spacewalk
A spacewalk is when an astronaut goes outside the spacecraft to work.
Q. What tool makes far-off stars and the Moon look big?
Options: A telescope · A magnifying glass · An antenna · A radar
Answer: A telescope
A telescope lets you see distant stars, moons, and planets big and clear.
Q. What telescope floats in space to observe stars and galaxies?
Options: A camera · A space telescope · A satellite · An observatory
Answer: A space telescope
A space telescope observes the universe more clearly from beyond the atmosphere.
Q. What robot vehicle drives around exploring the surface of Mars?
Options: A probe · A Mars rover · A satellite · A robot
Answer: A Mars rover
A Mars rover drives across the surface studying the soil and rocks.
Q. What is this — people landing on the Moon and riding a rover?
Options: Space station · Satellite · Diving · Moon exploration
Answer: Moon exploration
Humans landed on the Moon and drove a rover around to explore.
Q. What spacecraft flies to distant planets and sends back photos?
Options: A rocket · A space station · A probe · A satellite
Answer: A probe
A probe travels to faraway planets without people and sends information back.
Q. What is this mountain where underground magma bursts out?
Options: Volcanic crater · A volcano · A geyser · A hot spring
Answer: A volcano
A volcano is a mountain where magma from underground bursts out.
Q. What is this red, red-hot melted stuff flowing from a volcano?
Options: Lava · Mud · A volcano · Water
Answer: Lava
Lava is magma that has come out of the ground and flows as a super-hot liquid.
Q. What is this — smoke and ash bursting violently from a volcano?
Options: An earthquake · A storm · A volcanic eruption · A volcanic crater
Answer: A volcanic eruption
When a volcano erupts, hot ash, smoke, and lava blast out.
Q. What is this dip at a volcano's top that sometimes fills with water?
Options: A volcano · A volcanic crater · An impact crater · A lake
Answer: A volcanic crater
A volcanic crater is the pit at the top of a volcano where magma burst out.
Q. What is this, shooting hot water and steam up from underground?
Options: A hot spring · A geyser · A volcano · A waterfall
Answer: A geyser
A geyser is a spring where underground-heated water shoots up with steam.
Q. What is this place where warm water heated underground rises up?
Options: A lake · A geyser · A hot spring · A waterfall
Answer: A hot spring
A hot spring is where water warmed by underground heat bubbles up.
Q. What natural disaster shakes and cracks the ground?
Options: A flood · A typhoon · A volcano · An earthquake
Answer: An earthquake
An earthquake is when plates underground move, shaking and cracking the ground.
Q. What is this, land raised up high?
Options: A sand dune · A river · An island · A mountain
Answer: A mountain
A mountain is land pushed up high over a very long time.
Q. What deep valley did a river carve into the land over ages?
Options: An island · A waterfall · A canyon · A sand dune
Answer: A canyon
A canyon is a deep, narrow valley carved by a river over ages.
Q. What is this dark space hollowed out of rock or the ground?
Options: A cave · A plateau · A sand dune · A desert
Answer: A cave
A cave is an empty underground space made as water dissolved or carved the rock.
Q. What is this place where water pours down from a height?
Options: A plateau · A waterfall · A lake · A fjord
Answer: A waterfall
A waterfall is where a river pours down over a cliff.
Q. What is this wide place with almost no rain and lots of sand?
Options: A glacier · A plateau · A desert · A river
Answer: A desert
A desert is a dry region with very little rain and lots of sand.
Q. What is this hill of sand piled into waves by the wind?
Options: A beach · A desert · A cliff · A sand dune
Answer: A sand dune
A sand dune is a hill made as the wind carries and piles up sand.
Q. What is this steep drop at the coast or in the mountains?
Options: A lake · A valley · An island · A cliff
Answer: A cliff
A cliff is a steep drop carved over ages by waves or wind.
Q. What is this low, dipped place between mountains?
Options: A valley · A waterfall · A mountain · A cliff
Answer: A valley
A valley is the low land between mountains, and water often flows through it.
Q. What is this wide, flat land spread out high up?
Options: A hill · A desert · A plain · A plateau
Answer: A plateau
A plateau is wide, flat land spread out high above the surroundings.
Q. What is this ice mass, made of ages of snow, that flows slowly?
Options: An iceberg · Snow · A river · A glacier
Answer: A glacier
A glacier is snow piled up over ages into ice that flows very slowly.
Q. What is this stream of water flowing from high places to low?
Options: A lake · A cave · A river · A sand dune
Answer: A river
A river is rainwater and groundwater gathered into a big stream flowing to the sea.
Q. What is this place where water collects, surrounded by land?
Options: A fjord · A river · A lake · A desert
Answer: A lake
A lake is a wide body of water surrounded by land.
Q. What is this place with wide salty water and waves?
Options: A puddle · The sea · A lake · A river
Answer: The sea
The sea is the wide, salty water covering most of Earth's surface.
Q. What do we call land surrounded by sea?
Options: A mountain · A peninsula · An island · A continent
Answer: An island
An island is land surrounded on all sides by sea or water.
Q. What is this place where seawater filled a glacier-carved valley?
Options: A fjord · A lake · A canyon · A beach
Answer: A fjord
A fjord is a narrow bay made when seawater filled a deep valley carved by a glacier.
Q. What land forms where a river meets the sea and drops its soil?
Options: A plain · A delta · A beach · An island
Answer: A delta
A delta is land made from the soil a river carries and drops at the sea's mouth.
Q. What is this sandy place along the seaside?
Options: A desert · A beach · A cliff · An island
Answer: A beach
A beach is the sandy stretch that meets the seawater.
Q. What is this giant chunk of ice floating in the sea?
Options: An iceberg · A glacier · Ice · An island
Answer: An iceberg
An iceberg is a big chunk of ice that broke off a glacier and floats at sea.
Q. What is this place with water, grass, and trees in the middle of a dry desert?
Options: A spring · A puddle · A lake · An oasis
Answer: An oasis
An oasis is a spot in the desert where water rises and plants grow.
Q. What is this, spinning up from the sea like a column of water?
Options: A geyser · A waterspout · Waves · A tornado
Answer: A waterspout
A waterspout is a whirlwind over the sea or a lake that looks like a column of water.
Q. What is this grainy, hard rock used in buildings?
Options: Basalt · A mineral · Granite · A stalactite
Answer: Granite
Granite is hard rock formed as magma cooled slowly underground.
Q. What is this black rock full of holes, made by a volcano?
Options: Obsidian · Basalt · A fossil · Amber
Answer: Basalt
Basalt is black rock with holes formed as lava cooled quickly.
Q. What rock is made from sand piling up and hardening over ages?
Options: Obsidian · Sandstone · Basalt · Granite
Answer: Sandstone
Sandstone is made as sand piles up and hardens over a very long time.
Q. What glassy black rock is made by a volcano?
Options: Obsidian · Coal · Basalt · Granite
Answer: Obsidian
Obsidian is black rock made when lava cooled so fast it turned glassy smooth.
Q. What looks like a plain rock outside but is full of crystals inside?
Options: A mineral · A shell · A geode · A meteorite
Answer: A geode
A geode looks like a rock, but crack it open and sparkling crystals shine inside.
Q. What natural substance forms underground in many colors and shapes?
Options: Metal · Minerals · Quartz · Gems
Answer: Minerals
Minerals form naturally underground and are what rocks and gems are made of.
Q. What is this, the trace of an ancient creature left in stone?
Options: A shell · A fossil · A mineral · A rock
Answer: A fossil
A fossil is the body or trace of a creature from long ago, preserved in stone.
Q. What is this, an old dinosaur's bones you can see at a museum?
Options: A model · A dinosaur fossil · Dinosaur bones · A carving
Answer: A dinosaur fossil
A dinosaur fossil is bone from tens of millions of years ago, hardened like stone.
Q. What gem is made from hardened tree sap and sometimes traps insects?
Options: Glass · Amber · Tree sap · A gem
Answer: Amber
Amber is tree sap hardened over ages, and ancient insects sometimes got trapped inside.
Q. What rock grows downward from a cave ceiling like an icicle?
Options: A stalactite · A rock pillar · A boulder · An icicle
Answer: A stalactite
A stalactite grows as dissolved limestone slowly hardens on a cave ceiling.
Q. What is this cave full of giant crystal columns?
Options: A stalactite · An ice cave · A geode · A crystal cave
Answer: A crystal cave
A crystal cave is where enormous crystals grew over an incredibly long time.
Q. What are these stripes made from soil and sand piling up in layers?
Options: A rock · A pattern · A fossil · Rock strata
Answer: Rock strata
Strata are the striped layers formed as soil and sand piled up over ages.
Q. What is this pillar shape left as wind and rain carved the rock?
Options: A boulder · A rock pillar (hoodoo) · A stalactite · A canyon
Answer: A rock pillar (hoodoo)
A hoodoo forms as wind and rain wear away soft rock, leaving the hard parts standing.
Q. What landform did wind and rain carve through the rock like a bridge?
Options: A canyon · A natural arch · A rock · A tunnel
Answer: A natural arch
A natural arch forms as wind and rain wear a hole right through the middle of rock.
Q. What is this wide land covered white with salt after the water dried?
Options: A plateau · A mudflat · A salt flat · An ice field
Answer: A salt flat
A salt flat forms as salt water evaporates and leaves the salt behind, white and wide.
Q. What is this in the sky, made of tiny water droplets?
Options: Fog · A rainbow · A cloud · A feather
Answer: A cloud
A cloud is water vapor in the sky gathered into tiny droplets and ice.
Q. What are these clouds puffing up like balls of cotton?
Options: Smoke · Storm clouds · Cumulus clouds · Cotton
Answer: Cumulus clouds
Cumulus clouds puff up like cotton on a clear day.
Q. What are these thin, feathery clouds spread across the high sky?
Options: Cumulus clouds · Storm clouds · Fog · Cirrus clouds
Answer: Cirrus clouds
Cirrus clouds spread thin like bird feathers very high in the sky.
Q. What are these dark clouds covering the sky before rain?
Options: Cumulus clouds · Dust · Fog · Storm clouds
Answer: Storm clouds
Storm clouds are dark with gathered droplets — rain is coming soon.
Q. What is this seven-colored thing in the sky after the rain clears?
Options: Sunset glow · The aurora · A sun halo · A rainbow
Answer: A rainbow
A rainbow is sunlight split into seven colors as it passes through water droplets.
Q. What is this — two rainbows side by side?
Options: Sunset glow · A double rainbow · Light · The aurora
Answer: A double rainbow
A double rainbow appears when light reflects twice inside the droplets.
Q. What is this ring of light circling around the Sun?
Options: A sun halo · A halo · A cloud · A rainbow
Answer: A sun halo
A sun halo forms when ice crystals in high clouds bend sunlight into a ring.
Q. What is this, flashing down out of a storm cloud?
Options: A flash · Lightning · The aurora · Electricity
Answer: Lightning
Lightning is electricity built up in a cloud flowing all at once in a flash.
Q. What is this funnel-shaped wind spinning from the ground to the sky?
Options: A tornado · A whirlwind · A waterspout · A typhoon
Answer: A tornado
A tornado is a powerful, super-fast spinning funnel of wind.
Q. What is this big storm that looks like a giant swirl from space?
Options: Storm clouds · A hurricane (typhoon) · A gust · A whirlpool
Answer: A hurricane (typhoon)
A hurricane is a giant swirling storm born over warm seas, with fierce wind and rain.
Q. What falls from clouds as water droplets?
Options: Rain · Fog · Hail · A tornado
Answer: Rain
Rain is droplets in a cloud growing heavy and falling to the ground.
Q. What is this haze near the ground that makes it hard to see?
Options: Dust · Fog · A cloud · Steam
Answer: Fog
Fog is water vapor near the ground gathered into tiny droplets.
Q. What is this sand and dust blown by the wind, hazing over the sky?
Options: A dust storm · Dust · Smoke · Fog
Answer: A dust storm
A dust storm is desert sand and dust carried far by the wind.
Q. What is this — the sky turning red at sunset?
Options: The aurora · Sunset glow · A rainbow · Clouds
Answer: Sunset glow
Sunset glow is the sky turning red as sunlight slants through at the end of the day.
Q. What is this — the Sun coming up in the morning?
Options: Sunset · A sun halo · A rainbow · Sunrise
Answer: Sunrise
Sunrise is the Sun climbing above the horizon in the morning.