The Solar System

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What explains the number of impact craters on Mercury?

• It is very close to the Sun.
• The craters have been overrun by lava flows.
• It is not geologically active.
• It is subject to constant storms.

The largest volcano in the solar system is a __________ volcano a on the planet ___________.

• composite; Mars
• shield; Mars
• composite; Venus
• shield; Venus

What is true of life on the inner planets?

• Earth's Moon had life in ancient oceans.
• Venus has microbes beneath its thick atmosphere
• Mars has ancient fossil microbes
• There is only life on Earth

Why is Venus the hottest planet?

• It is closest to the Sun
• It has a powerful greenhouse effect.
• It has the most internal heat
• It spins the fastest.

Evidence for liquid water in the Martian past includes

• water-eroded canyons
• fossil fish
• the presence of polar ice currently
• all of these

All of the inner planets were once geologically active.

• True
• False

Venus has the largest greenhouse effect of the inner planets.

• True
• False

Venus is the only inner planet with a large moon besides Earth.

• True
• False

Besides Earth, the inner planets are all solid.

• True
• False