Earth Day

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Across
  1. 2. a large area covered with trees and undergrowth
  2. 6. a natural underground chamber in a cliff
  3. 9. a living organism that feeds on organic matter, a mammal
  4. 10. the branch of biology that deals with the relations of organisms to one another
Down
  1. 1. natural Earth and the things on it. the trees, birds and animals
  2. 3. an individual animal, plant,or single called life form
  3. 4. convert waste into reusable material
  4. 5. an opening in Earth's crust through which lava, volcanic ash, and gases escape
  5. 7. a large amount of water covering an area of land that is usually dry
  6. 8. period of dryness