Across
- 2. A single-celled organism that lives in water
- 4. A colorless, odorless gas that makes up most of the air
- 5. What you get when you combine the circled letters across
- 7. A wide river
- 10. A large body of salt water
Down
- 1. A frozen mass of snow and ice
- 2. A layer of gas surrounding Earth
- 3. A hot, dry region with little rain
- 6. A natural source of light and heat
- 8. A natural solid aggregate of minerals
- 9. A long, narrow piece of land jutting into a body of water