Protect Nature

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