Word work

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Across
  1. 6. The world around us, including plants, animals, air, and water.
  2. 7. To protect something from harm or danger.
  3. 8. A very dry place with little water and few plants.
  4. 9. A cold place with frozen ground and very few trees.
Down
  1. 1. To keep something safe and take care of it.
  2. 2. To stop something bad from happening.
  3. 3. A warm, wet forest with lots of trees and animals.
  4. 4. When a type of animal or plant might disappear forever.
  5. 5. A way to fix a problem.