Across
- 7. the layers of gases surrounding a planet
- 9. slowly moving pieces of Earth's crust
- 10. matter that settles at the bottom of liquid
- 11. the study of the earth
- 12. geological process of wearing away
Down
- 1. a natural event that causes great damage
- 2. the total amount of water on a planet
- 3. the parts of Earth where life exists
- 4. long-term pattern of weather in a particular area
- 5. plant life
- 6. animal life
- 8. the rocky outer part of the Earth