Environment Crossword

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Across
  1. 2. main constituent of the environment
  2. 4. introducing harmful materials into the environment
  3. 6. dense forest rich in biodiversity with heavy rainfall
  4. 7. a very large expanse of sea
  5. 9. occurs when a species population exceeds
  6. 10. found on land
  7. 11. protective gas layer from sun's UV-B radiation
  8. 12. found in sea
Down
  1. 1. derived of living matter
  2. 3. thin layer of gases covering the earth
  3. 5. process by which plants synthesize food from co2 and water
  4. 8. Plants grow in this