Font size
WorksheetsIntroduction to Earth
Total questions: 121
Worksheet time: 1hrs 1mins
Which force from the Moon causes ocean water to move up and down along the coasts?
Heat from the Moon warming the sea
Moonlight shining on ocean waves
Moon’s tidal pull on ocean water
Winds blowing from the Moon’s surface
What is Earth’s mantle a source of that can come out of volcanoes?
Magma that erupts as lava
Sand blown by strong winds
Clouds that form heavy rain
Ice from deep underground
Earth’s atmosphere is very massive. Which effect can this moving air help create?
Storms and lightning strikes
Quiet, windless oceans
Sunlight becoming brighter
Solid rock turning to metal
Where do living things exist according to the material?
Just inside deep volcanoes
In oceans, crust, and surface
Only in forests and fields
Only on mountain tops
Why does Earth’s orbit stay almost the same path around the Sun?
Earth’s mountains push it forward in space
Winds in space guide Earth’s travel
The Sun’s large mass keeps planets steady
The Moon pulls Earth in straight lines
If the Sun suddenly exploded, what would most planets and space rocks likely do?
Orbit faster in bright sunlight
Freeze in place near the Sun
Drift into darkness and fly away
Crash together and form one planet
The continents slide on the mantle over time. What kind of change is this an example of?
Instant space travel by Earth
Sudden growth of new oceans
Fast weather change in a day
Slow movement of Earth’s surface
A student sees waves sloshing higher on a shore during certain times. Using what you know, which cause is most reasonable?
Plants swimming toward the beach
Sunlight heating only the shore
Mountains pushing water sideways
Strong pull of the Moon’s gravity
What does Earth’s core do over time?
It warms and cools every single day
It stays exactly the same temperature
It cools down slowly over time
It keeps getting hotter and hotter
What is one consequence when Earth’s core cools completely?
Stronger continental drift happens
More volcanoes appear everywhere
New tall mountains quickly form
Land becomes geologically dead
What important protective feature would Earth lose if the core cooled completely?
The pull of gravity forever
All of its ocean water
Its strong magnetic field
Thick clouds around the planet
If a straight hole went through Earth, what would the core’s temperature do to someone who jumped in?
Freeze them into ice quickly
Cool them and slow their fall
Warm them gently for a while
Vaporize them from extreme heat
As you fall toward Earth’s center, what happens to your speed?
You gain speed continuously
You slow down the whole way
Your speed stays exactly constant
You stop moving right away
What is gravity like exactly at Earth’s center?
Very strong downward pull
Strong upward push
Zero, with no pull
Only sideways tugging
If you passed the center, what would happen next to your motion?
You spin in circles at the center
You stop and float forever
You overshoot then slow to the other side
You bounce back to the surface instantly
Without anyone to catch you, how long would each trip take from one side of Earth to the other through the tunnel?
About 3 hours each way
About 90 minutes each way
About 45 minutes each way
About 15 minutes each way
Which gas quickly escapes Earth’s atmosphere because its tiny atoms move very fast?
Oxygen stays because it moves slower
Carbon dioxide escapes because it is heavy
Nitrogen stays because it moves slower
Hydrogen escapes because it moves very fast
What does escape velocity describe for a planet like Earth?
The speed to leave a planet’s gravity
The size of the planet’s core
The number of clouds in the sky
The temperature of the upper air
Why do oxygen and nitrogen remain in Earth’s atmosphere?
They are created only by volcanoes on Earth
They move around 1,000 mph, below escape speed
They move faster than 25,000 mph, above escape speed
They are heavier than water and sink to ground
Scientists can use electrolysis to get hydrogen. What do they split apart?
Water molecules into hydrogen and oxygen
Air molecules into nitrogen and helium
Rock minerals into iron and carbon
Cloud droplets into rain and mist
If Earth’s escape velocity is about 25,000 mph, which choice best matches a molecule that cannot escape?
A molecule moving near 80,000 mph
A molecule moving near 50,000 mph
A molecule moving near 30,000 mph
A molecule moving near 1,000 mph
Which statement best explains why we won’t wake up to a vacuum on Earth?
Atmospheric gases move slower than escape speed
The Sun pushes all gases back to Earth
Mountains trap air so it cannot leave
Stars add new air to Earth each night
What is the Moon to Earth?
A small planet near Earth
Earth’s only natural satellite
A comet that passes by often
Earth’s brightest star at night
Which statement about the Moon’s light is true?
Half the Moon is always sunlit
The Moon is never lit in daytime
The Moon makes its own light
Only the full Moon is sunlit
Why do we see different Moon phases during a month?
It orbits Earth changing viewing angles
It changes size as it grows older
Clouds cover parts of the Moon
The Sun turns brighter and dimmer
Which phase shows the whole sunlit side facing Earth?
Waning Crescent
New Moon
First Quarter
Full Moon
The lunar highlands can have craters up to what size?
About 2,000 miles across
About 200 miles across
About 50 miles across
About 20 miles across
How tall can the walls of some lunar craters rise?
Up to 10,000 feet high
Up to 100 feet high
Up to 500 feet high
Up to 1,000 feet high
A map shows two craters: one is 150 miles across and one is 1,500 miles across. Which is closer in size to the largest crater mentioned?
Neither is close in size
150-mile crater is closer
1,500-mile crater is closer
Both are the same size
Look at the labeled Moon diagram. What are the dark, smooth areas called where lava once filled large basins?
Ice plains or sheets
Cloud belts or bands
Lunar maria or mares
Star fields or clusters
In the crater close-up image, what shape best describes most lunar craters?
Tall sharp mountains
Round bowls with rims
Long thin valleys
Flat squares with edges
Which labeled feature on the Moon is a crater, not a mare?
Mare Crisium basin
Mare Tranquillitatis
Tycho with bright rays
Mare Nubium plain
What does the word 'mare' mean when naming Moon features like Mare Imbrium?
Sea or ocean area
Frozen ice sheet
Mountain peak zone
Windy cloud belt
Why can Earth keep gases like nitrogen and oxygen, but the Moon cannot?
Moon makes strong winds
Earth is closer to Sun
Earth has stronger gravity
Moon rotates too fast
About how strong is the Moon’s gravity compared to Earth’s?
Ten times stronger
Twice as strong
Equal strength
One-sixth as strong
What happens to most gas molecules near the Moon?
They glow like stars
They turn into rain
They freeze into rocks
They escape into space
Which picture best helps you identify a mare on the Moon?
A picture of ocean waves
A drawing of Earth’s clouds
A single crater close-up
The full Moon with labeled names
If you were choosing a smooth landing area, which feature would be safest?
A tall mountain ridge
A rocky boulder field
A sharp-rimmed crater
A wide dark mare plain
Which sentence best explains the Moon’s tiny atmosphere pressure?
Strong winds push air downward
Water lakes create heavy clouds
Many plants make thick oxygen
Weak gravity cannot hold fast gases
Which group are Mercury, Venus, Earth, and Mars part of?
Large icy comets group
Craggy asteroid rocks group
Small rocky planets group
Giant gaseous planets group
Which planets are called the gas giants in our solar system?
Mercury Venus Earth Mars
Earth Moon Sun Mars
Jupiter Saturn Uranus Neptune
Pluto Ceres Eris Haumea
Most planets move around the Sun in what kind of path together?
Straight lines without bending
Different planes and random turns
Same plane and same direction
Up and down like bouncing balls
Why do astronomers think the solar system formed from a spinning gas cloud?
The Moon shines with its own light
Comets fly in zigzag paths
Asteroids are made of pure ice
Planets share a plane and direction
What does it mean that Earth and the Moon are in a mutual orbit?
The Moon does not move at all
Earth orbits the Moon only
They both orbit the Sun together
They orbit in different galaxies
Which statement about the Sun’s gravity and orbits is true?
The Moon pulls the Sun around
Earth wins and controls every orbit
The Sun still controls the bigger path
Nothing orbits the Sun in space
Where is the asteroid belt located in our solar system?
Between Mars and Jupiter
Beyond Neptune only
Inside Earth’s atmosphere
Right next to the Sun
What is the Kuiper Belt mostly made of?
Clouds of burning gas
Metallic mountains and sand
Hot lava and volcanoes
Icy comets and dwarf objects
What happens to hydrogen deep inside Jupiter because of very high pressure?
It disappears completely
It changes into helium gas
It freezes into solid crystals
It turns into metallic hydrogen
Which layer helps make Jupiter’s strong magnetic field?
Metallic hydrogen layer
Thin cloud layer
Rocky ring layer
Outer ice layer
Scientists first suggested metallic hydrogen in 1935. When was it made in a lab?
1930
2006
1956
1996
About how much of Jupiter’s radius is under enough pressure to create metallic hydrogen?
Ten percent of the radius
Sixty percent of the radius
Two percent of the radius
All of the radius
Look at the cutaway pictures. Which planet shows a large metallic hydrogen region like Jupiter?
Uranus
Neptune
Earth
Saturn
In the diagram, what are the gas layers made of for Uranus and Neptune?
Pure nitrogen gas
Carbon dioxide and oxygen gas
Steam and dusty gas
Hydrogen, helium, methane gas
Which part of these giant planets is shown as the core in the diagram?
Rock and ice core
Liquid iron core
Hot lava core
Pure diamond core
If metallic hydrogen needs very strong pressure, where would you most expect to find it in a gas giant?
Deep inside near the center
On the cold surface
High in the outer clouds
Inside the rings far away
Which statement best explains why Saturn could float in a giant bathtub of water?
Its overall density is less than water
Its size makes it lighter than Earth
Its moons help hold it above water
Its rings push it upward in water
What is the approximate density of water used for comparing planets?
About 1 gram per cubic centimeter
About 10 grams per cubic centimeter
About 5 grams per cubic centimeter
About 0.1 grams per cubic centimeter
Saturn’s density is around 0.687 g/cm^3. What does this suggest?
It is the same density as water
It is less dense than water
It has no density at all
It is more dense than water
Which group of planets is described as gas-rich and less dense than rocky planets?
Mercury, Venus, Earth, Mars
Jupiter, Saturn, Uranus, Neptune
Pluto, Ceres, and Eris
Earth, Moon, and Sun
Why can Saturn’s rings seem to disappear when we see them edge-on from Earth?
They are invisible all the time
They move behind the planet forever
They melt when facing the Sun
They are very thin compared to their size
About how thick can parts of Saturn’s rings be?
From 30 miles to 100 miles
Thicker than a piece of paper
Exactly 10 feet everywhere
From 30 feet to a mile and a half
Which comparison helps show how skinny Saturn’s rings are?
A pencil is wider than the planet
A cloud is heavier than the rings
A piece of paper is 100 times thicker
A mountain is thinner than the rings
What did Galileo notice about Saturn’s rings in 1610?
They seemed to vanish when viewed edge-on
They glowed brighter than the Sun
They turned different colors every night
They were made of solid metal only
If Saturn’s density falls under water’s density, what would likely happen in water?
It would break apart
It would sink quickly
It would dissolve
It would float
Which word best describes Pluto’s path around the Sun that sometimes brings it closer than Neptune?
Perfect circle orbit around the Sun
Eccentric orbit that is stretched
Square-shaped orbit with sharp corners
Straight line path through space
In 1979, what unusual thing happened with Pluto’s distance from the Sun?
It became the closest planet to the Sun
It moved closer than Neptune for a while
It stopped orbiting the Sun completely
It switched places with Earth forever
About how long is Pluto’s full trip around the Sun?
20 years for one season
12 months for one year
24 hours for one day
248 years for one orbit
On January 17, 2227, which planet will be the furthest from the Sun again?
Venus will be furthest again
Mars will be furthest again
Neptune will be furthest again
Earth will be furthest again
What does retrograde rotation mean for a planet like Venus?
It spins the usual forward way
It does not spin at all ever
It spins faster than light speed
It spins backwards compared to most
Why do some scientists think Venus and Uranus spin in a strange way?
They were slammed by a large protoplanet
They changed spin to match the Moon
They were pushed by gentle solar winds
They copied Earth’s rotation exactly
Which statement about a connection between Venus and Uranus is most accurate?
They affect each other directly every day
They are too far apart to be connected
They share the same thin atmosphere
They orbit each other like twin moons
For Venus, a single day of spinning is longer than its year. What would a person there notice?
More days than years would pass
More years than days would pass
Exactly equal days and years pass
No days or years would ever pass
Which planet in the picture shows a very large axial tilt near 98 degrees?
Saturn with tiny tilt angle
Uranus with around 98 degrees
Earth with zero degrees tilt
Mercury with ninety degrees tilt
What does the symbol θ (theta) shown above each planet represent?
Number of moons orbiting
Distance from Sun in miles
Planet’s mass in kilograms
Axial tilt angle of the planet
Which planet spins backwards compared to most, as shown by the arrows?
Jupiter with fastest spin
Neptune with forward spin
Venus with retrograde spin
Earth with normal spin
If a giant collision can change a planet’s tilt, which outcome is most likely?
The planet’s axis can be knocked over
The planet stops moving forever
The planet turns into a bright star
The planet loses every single moon
Which choice best describes a gas giant planet in our solar system?
Small, rocky surface with hard ground
Medium, mostly metal with sharp mountains
Tiny, covered in thick ice layers only
Huge, made mostly of gases like hydrogen
You plan a mission to land on a planet with very weak gravity. What is one effect of weak gravity on your body and gear?
You float more and need careful steps
You feel heavier and move slower always
You sink into soft ground quickly
You cannot breathe even with suits
Your shelter must protect you from the planet’s climate and radiation from the Sun. Which material feature helps most with radiation protection?
Transparent screens without layers
Open roof for fresh air and views
Thick shielding walls and small windows
Thin cloth walls and big windows
Which question helps you describe a planet’s atmosphere for your mission plan?
What colors are the sunsets daily
What animals live there already
What is the atmosphere like, if any
How tall are volcanoes on land
When choosing where to live on a planet, which location might have the most direct sunlight and warmth?
Crater bottoms in deep shade
Darkside facing away forever
Equator with regular daytime sunlight
Poles with long winter darkness
You need water to support life on your planet base. Which is a safe way to plan for water?
Drink fuel stored for rockets
Use dry air as a water source
Recycle water and melt local ice
Bring none and hope for rainstorms
Which statement is true about terrestrial planets compared to gas giants?
They never have mountains or craters
They are bigger and purely made of gas
They glow with light like small stars
They have solid surfaces you can land on
What is a good reason to wear a spacesuit on a planet with no atmosphere?
To make walking much harder always
To see better without any helmet
To change the planet’s weather quickly
To breathe air and stay pressurized
You must bring food to your new planet. Which plan supports life for a long time?
Skip meals to save time daily
Grow crops inside your shelter garden
Eat only packed snacks forever
Hunt local animals found easily
Landing safely is part of your mission plan. Which step helps a spacecraft land on a planet with thin air?
Drop straight down without guidance
Use heat shields and rocket thrusters
Use parachutes only without engines
Open windows to slow the craft
What are asteroids mostly made of?
Burning pieces of air
Craggy chunks of rock
Glowing balls of gas
Balls of dirty ice
Where do most asteroids orbit together in space?
Far beyond Neptune
Between Earth and Venus
Between Mars and Jupiter
Beside Saturn’s rings
What are comets mostly made of?
Clouds of pure gas
Balls of dirty ice
Flat sheets of dust
Hot metal and sand
What is a meteor?
A planet with icy rings
A rock stuck on the moon
Whatever burns up in Earth’s atmosphere
A star exploding in space
Which place is a giant sphere with trillions of comets?
Saturn’s rings
Kuiper Belt
Oort Cloud
Asteroid Belt
Which region holds thousands of icy objects beyond Neptune, including Pluto?
Asteroid Belt
Oort Cloud
Kuiper Belt
Mars Canyon
Why does a comet have a visible tail when near the sun?
The moon shines on the ice
Gravity pulls light behind it
Sublimated gases and dirt stream out
Wind blows space dust
What can happen if a comet breaks up near Earth?
We see a rainbow storm
We get meteor showers
We feel stronger gravity
We lose our atmosphere
In the comet diagram, what is the small solid part at the center called?
Coma cloud
Dust tail
Nucleus core
Hydrogen envelope
Which part of a comet is the fuzzy glow around the nucleus?
Rocky crust
Sunlight arrow
Coma
Ion tail
What happens to comet tails as the comet gets closer to the Sun?
They switch places
They get longer
They disappear
They get shorter
Which tail points straight away from the Sun?
Dust tail
Ion tail
Coma tail
Hydrogen tail
Which tail curves more toward the comet’s path?
Ion tail
Coma tail
Dust tail
Solar tail
Why do comet tails point away from the Sun?
Stars blow tails forward
Sun’s heat pushes gas away
Earth’s gravity tugs tails
Moon’s pull turns tails
What word describes ice turning straight into gas near the Sun?
Sublimation
Freezing
Melting
Condensation
When tiny space rocks hit Earth’s air, what slows them down?
Earthquakes
Ocean waves
Mountain shadows
Atmospheric friction
Most meteors seen in the sky are about what size?
As big as cars
As wide as buses
As large as houses
No bigger than peas
Why are more meteors often seen after midnight on clear nights?
Clouds pull them
The facing side meets more debris
The Sun lights them
The Moon makes them
What causes a meteor shower to happen?
Earth passes through extra debris
The Moon eats dust
Mountains block wind
Earth stops moving
Which statement best compares ion and dust tails?
Neither tail changes with sunlight
Ion tail points away; dust tail curves
Dust tail points away; ion tail curves
Both curve toward orbit path
What main process makes a star shine by releasing energy?
Wind blowing through space
Freezing gas into crystals
Thermonuclear fusion in its core
Electric sparks around planets
Look at the top diagram showing star stages. Which stage can an average star become after swelling up?
Red giant with a puffy outer shell
Large asteroid with many craters
Blue comet with icy tail
Rocky planet with mountains
Which choice best describes a white dwarf?
Giant storm on a planet
Small dense leftover core
Spinning ring of ice
Huge bright gas cloud
According to the life cycle picture, what forms first before any star begins to shine?
Metal pieces from asteroids
Hot lava from volcanoes
Stellar nebula of gas and dust
Water cloud from oceans
When very massive stars run out of fuel, what dramatic event can happen?
Quiet breeze near Earth
Soft glow like a nightlight
Gentle snowstorm on Mars
Supernova explosion in space
Use the picture paths. Which two different endings can follow a supernova?
Comet or small planet
White dwarf or red giant
Neutron star or black hole
Sun or moon
Which element change happens first inside stars during fusion?
Oxygen turns into water
Iron turns into gold
Carbon turns into rock
Hydrogen turns into helium
A student says, “All stars die the same way.” Use the diagrams and text. Which answer best corrects the idea?
Star endings depend on their mass
Every star becomes a comet
All stars become new planets
Huge stars always shrink gently
Look at the average-star path. What comes after a red giant?
Planetary nebula then white dwarf
Supernova then black hole
Moon then rocky asteroid
Neutron star then red supergiant
Why does iron cause trouble when formed in a massive star’s core?
It absorbs energy and stops radiating
It freezes the whole star
It makes the star spin faster
It melts into shiny lava
Which tool can help you find constellations in the night sky?
Plant guides and garden tools
Weather thermometers and rain gauges
Ocean tide charts and compasses
Star maps and smartphone apps
What does the planetarium software link allow you to do?
Explore stars on a web planetarium
Buy telescopes from an online store
Watch cartoons about space online
Share photos on a social network
Who named the western zodiac group of constellations?
Galileo, a modern physicist
Magellan, a sea explorer
Newton, a famous inventor
Ptolemy, an ancient astronomer
The western zodiac is based on what path in the sky?
Airplanes’ flight paths
Comets’ paths during storms
The Sun’s path through the year
The Moon’s path each night
Why do zodiac constellations change visibility with seasons?
Because mountains block the sky sometimes
Because telescopes need new batteries
Because stars turn off and on randomly
Because the Sun’s yearly path shifts view
