Earth Day Quiz

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Across
  1. 1. one of the 3 R's
  2. 3. made from sand can be recycled
  3. 4. potential source of clean energy, a molecule
  4. 5. large group of trees
  5. 8. another word for taking care of
  6. 9. what region produces 20% of planet’s oxygen?
Down
  1. 2. one of types of fossil fuel
  2. 3. gases trapped in earth's atmosphere
  3. 6. April 22
  4. 7. there is a hole in the _ layer