Across
- 3. the liquid water found on Earth
- 4. where life exists
- 7. the fourth layer of the atmosphere
- 8. the second layer of the Earth
- 9. the third layer of the Earth
Down
- 1. the outermost layer of the atmosphere
- 2. first layer of the atmosphere
- 3. a region of space that is the right distance from the sun to allow for life
- 5. the most outer part of the Earth
- 6. the third planet in the solar system