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- 1. Multiple Choice
Mars's atmosphere is composed mostly of
nitrogen.
hydrogen.
oxygen.
carbon dioxide.
- 2. Multiple Choice
Some regions of Mars have giant
lakes.
volcanoes.
forests.
rivers.
- 3. Multiple Choice
All the inner planets have an atmosphere except
Mercury.
Venus.
Earth.
Mars.
- 4. Multiple Choice
The inner planets that experience a greenhouse effect are
Mercury and Mars.
Venus and Mars.
Venus and Earth.
Mercury and Earth.
- 5. Multiple Choice
The inner planets are small and dense and have smooth surfaces.
True
False
- 6. Multiple Choice
Mercury rotates so slowly that its day is longer than its year.
True
False
- 7. Multiple Choice
The thick clouds on Venus are made up mostly of carbonic acid droplets.
True
False
- 8. Multiple Choice
Earth is unique in our solar system for having liquid mercury on its surface.
True
False
- 9. Multiple Choice
Oxygen makes up about 20 percent of Earth's atmosphere.
True
False
- 10. Multiple Choice
Space ships have given scientists important information about Mercury, Venus, and Mars.
True
False
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