Chapter 19 The Solar System REVIEW

1. Which solar system object is the largest?

• A. asteroid
• B. the Sun
• C. the Moon

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2. Which best describes the asteroid belt?

• A. another name for the Oort Cloud
• B. large chunks of gas, dust, and ice
• C. millions of small rocky objects

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3. Which describes a planets speed as it orbits the Sun?

• A. it increases then decreases
• B. it does not change
• C. it constantly increases

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4. The diagram below shows a planet's orbit around the Sun. What does the blue arrow represent?

• A. the gravitational pull of the Sun
• B. the planet's orbital path
• C. the planet's speed

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5. Which describes the greenhouse effect?

• A. energy emitted by the Sun
• B. reflection of light from a planet
• C. energy trapped by atmosphere

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6. How are terrestrial planets similar?

• A. similar densities
• B. similar rocky surfaces
• C. similar diameters

7. Which inner planet is the hottest?

• A. Mercury
• B. Earth
• C. Venus

8. Which two gases make up most of the outer planets?

• A. carbon dioxide and methane
• B. hydrogen and helium
• C. ammonia and helium

9. Which best describes an asteroid?

• A. wet
• B. round
• C. icy
• D. rocky

10. The photograph below shows how Earth appears from space. How does Earth differ from other inner planets?

• A. It's atmosphere contains large amounts of methane.
• B. It's period of revolution is much greater.
• C. It's surface is covered by large amounts of liquid water.

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