Interdisciplinary project

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Across
  1. 5. an if clause that ends with d.
  2. 8. undomesticated living species.
  3. 9. mountain with a big hole on the top.
  4. 12. what we need to breathe.
  5. 13. a large chunk of ice floating in open water.
  6. 15. simple past of shine.
  7. 16. place where water falls vertically.
  8. 17. we exhale this.
  9. 18. an if clause that starts with m.
  10. 19. used to express a possibility or ask for permission.
Down
  1. 1. living organisms that live in the water.
  2. 2. the surroundings in which we operate; the natural world.
  3. 3. past participle of come.
  4. 4. a very high mass of rock that's almost vertical.
  5. 6. past participle of bite.
  6. 7. past participle of catch.
  7. 10. simple past of rise.
  8. 11. used to express inevitable events.
  9. 14. similar to power.
  10. 16. material that can no longer be used.