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Unit 18: Planets Review

Total questions: 42

Worksheet time: 21mins

Name
Class
Date
1.

Which planets are often called the terrestrial planets?

a)
Mercury, Venus, Earth, and Mars
b)
Venus, Earth, Mars, Jupiter
c)
Mercury, Jupiter, Saturn, Uranus
d)
Jupiter, Saturn, Uranus, Neptune
2.

Which planet rotates on its axis in about the same amount of time that Earth does?

a)
Mars
b)
Venus
c)
Mercury
d)
Jupiter
3.

What are the 3 main layers of the Earth?

a)
Magma, Crust, Core
b)
Crust, Mantle, Core
c)
Lithosphere, Asthenosphere, Mesosphere
d)
Outer core, Inner core, Mantle
4.

What is Earth's dense inner core made of?

a)
Aluminum and titanium
b)
Gold and silver
c)
Copper and zinc
d)
Iron and nickel
5.

Which planet is tidal-locked to the sun?

a)
Venus
b)
Earth
c)
Mars
d)
Mercury
6.

Which planet is the smallest in the solar system?

a)
Jupiter
b)
Mercury
c)
Earth
d)
Venus
7.

Why does Mercury have a greater range of temperatures than any other planet?

a)
Mercury has almost no atmosphere to retain heat.
b)
Mercury is closer to the Sun than any other planet.
c)
Mercury has a highly reflective surface that causes temperature fluctuations.
d)
Mercury has a thick atmosphere that traps heat.
8.

Because Venus is often a bright object in the west after sunset, it is sometimes called the

a)
Evening Star
b)
Afternoon Star
c)
Night Star
d)
Morning Star
9.

Why are Venus and Earth sometimes referred to as "sister planets"?

a)
They are the closest planets to Mars.
b)
They are similar in size, composition, and proximity to the Sun.
c)
They are the only planets with moons.
d)
They have different atmospheres and surface temperatures.
10.

The gas that makes up most of Venus's atmosphere is?

a)
nitrogen (N2)
b)
methane (CH4)
c)
carbon dioxide (CO2)
d)
oxygen (O2)
11.

The trapping of heat by the atmosphere of Venus is called the

a)
Solar radiation effect
b)
Ozone layer effect
c)
Thermal inversion effect
d)
Greenhouse effect
12.

The atmosphere on Mars is composed mostly of

a)
nitrogen (N2)
b)
oxygen (O2)
c)
carbon dioxide (CO2)
d)
helium (He)
13.

Why is Mars called "the red planet"?

a)
Because it is covered in strawberry jam
b)
Due to excessive pollution from alien factories
c)
Because it is made of red cheese
d)
Due to iron oxide (rust) on its surface
14.

How are Mars and Earth similar?

a)
They both have seasons, polar ice caps, and rocky surfaces.
b)
They both have rings around them.
c)
They are both gas giants.
d)
They both have liquid water on the surface.
15.

Mars has two moons, what are their names?

a)
Phobos and Deimos
b)

Callisto and Europa

c)

Ganymede and Io

d)

Europa and Triton

16.

Which planet is home to Olympus Mons, the largest volcano in the solar system?

a)
Jupiter
b)
Mars
c)
Earth
d)
Venus
17.

Which planet is the only known planet to harbor life?

a)
Earth
b)
Mercury
c)
Mars
d)
Venus
18.

The four outer planets do not have solid...

a)
cores
b)
atmospheres
c)
surfaces
d)
liquids
19.

Which four planets are known as the gas giants?

a)

Earth, Saturn, Mars, Merucry

b)

Saturn, Jupiter, Uranus, Neptune

c)

Neptune, Uranus, Mars, Earth

d)

Venus, Neptune, Uranus, Jupiter

20.

What are the four main gasses found in the gas giants?

a)
nitrogen, argon, carbon dioxide, sulfur dioxide
b)
oxygen, neon, krypton, xenon
c)
water vapor, carbon monoxide, nitrogen dioxide, ozone
d)
hydrogen, helium, methane, and ammonia
21.

Describe the composition of the rings around the gas giants

a)
Plastic, copper, and nitrogen
b)
Diamonds, sulfur, and helium
c)
Ice, rock, and dust particles
d)
Metal, gas, and liquid hydrogen
22.

Which planet is the largest in the solar system?

a)
Mars
b)
Saturn
c)
Neptune
d)
Jupiter
23.

What is the Great Red Spot?

a)
A massive volcano on Mars
b)
A giant storm on Jupiter
c)
A large desert on Earth
d)
A deep trench in the Pacific Ocean
24.

The Great Red Spot and Red Spot Jr. are located on what planet?

a)
Saturn
b)
Mars
c)
Jupiter
d)
Neptune
25.

The planet with the largest rings is

a)
Jupiter
b)
Neptune
c)
Mars
d)
Saturn
26.

How is Saturn able to radiate so much heat?

a)

"Raining out" of helium from its core

b)
Saturn is a star
c)
Saturn is made of lava
d)
Saturn absorbs heat from the Sun
27.

Why does Uranus look blue-green?

a)
It's a holographic projection
b)

The atmosphere causes light to reflect in those wavelengths

c)
Methane in the atmosphere absorbs red light and reflects blue and green light.
d)

Its rings allow it to retain more heat than is usually found on large planets such as the gas giants

28.

How is the rotation of Uranus unlike that of most of the other planets?

a)
Uranus rotates in the opposite direction of other planets
b)
Uranus rotates faster than other planets
c)
Uranus rotates on its side.
d)
Uranus rotates clockwise
29.

Why does Neptune have a dark-blue color?

a)
Neptune absorbs all colors except blue.
b)
Neptune is made of dark-colored rocks and minerals.
c)
Methane in its atmosphere absorbs red light and reflects blue light.
d)
Neptune's dark-blue color is due to its proximity to other planets.
30.

Which planet is the coldest?

a)
Saturn
b)
Neptune
c)
Mars
d)
Uranus
31.

Which planet is the windiest?

a)
Mars
b)
Saturn
c)
Neptune
d)
Jupiter
32.

Why is Pluto no longer considered a planet?

a)
Pluto is too small to be considered a planet.
b)
Pluto is not spherical in shape like other planets.
c)
Pluto is too far from the Sun to be classified as a planet.
d)
Pluto does not clear its orbit of other debris.
33.

Which planet is this?

a)

Earth

b)

Venus

c)

Mars

d)

Neptune

34.

Which planet is this?

a)

Mercury

b)

Uranus

c)

Saturn

d)

Neptune

35.

Which planet is this?

a)

Mercury

b)

Uranus

c)

Saturn

d)

Neptune

36.

Which planet is this?

a)

Venus

b)

Jupiter

c)

Saturn

d)

Neptune

37.

Which planet is this?

a)

Venus

b)

Jupiter

c)

Mars

d)

Neptune

38.

Which planet is this?

a)

Venus

b)

Jupiter

c)

Mars

d)

Neptune

39.

Which planet is this?

a)

Uranus

b)

Jupiter

c)

Venus

d)

Neptune

40.

Which planet is this?

a)

Uranus

b)

Jupiter

c)

Saturn

d)

Neptune

41.

Why is Mercury so hard to observe?

a)
Mercury is hard to observe because it is located too far from Earth.
b)
Mercury is hard to observe because it has a thick atmosphere that distorts images.
c)
Mercury is hard to observe due to its proximity to the Sun and its small size with no substantial atmosphere.
d)
Mercury is hard to observe due to its bright surface that reflects sunlight away.
42.

Why does Neptune have such a strong magnetic field?

a)
Interaction with nearby celestial bodies
b)
Combination of large size, fast rotation, and conductive layer of liquid metallic hydrogen
c)
Presence of rare earth elements
d)
Intense solar radiation exposure

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