Earth Day Puzzle

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Across
  1. 4. Something that can be used again and again
  2. 7. A species that no longer exists
  3. 8. A Molecule composed of three oxygen molecules
  4. 9. The environment that animals live in
  5. 10. Living matter
Down
  1. 1. The energy that the sun produces
  2. 2. Trash not disposed of properly
  3. 3. Where most trash goes once it's thrown away
  4. 5. broken-down organic matter.
  5. 6. The layer of gases surrounding Earth