Puzzle

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Across
  1. 3. the 6- letteredword of the 3 (R's)
  2. 5. the organism that undergoes the process photosynthesis
  3. 8. the process of clearing forests
  4. 9. A synthetic polymer that polutes the earth
Down
  1. 1. The process that plants use to make their own food
  2. 2. the method of collecting rainwater and saving it
  3. 4. A species in the risk of extinction
  4. 6. the melting of ice glaciers
  5. 7. covers 97% of the earth