Across
- 5. This word means able to support life
- 7. Planets need liquid water and this in order to be habitable
- 9. Mercury, Venus, Earth and Mars are inner planets and made of this
- 10. This geologic process formed the channel on Mars
- 11. This type of rock was found near the Mars channel and is formed by sediment moved by flowing water
Down
- 1. All the liquid water and ice on a planet
- 2. The mixture of gases surrounding a planet
- 3. This is one way that scientists can study the landforms, called novae, on Venus
- 4. These are made of gas and ice, Neptune is an example
- 6. The solid part or land of a rocky planet
- 8. A set of interacting parts that form a complex whole