Science crossword

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Across
  1. 1. the amount of hydrogen.
  2. 4. non-living feature
  3. 6. runoff from storm.
  4. 8. a living organism that indicates health.
  5. 9. when 2 animals live in the same area.
Down
  1. 1. a hunter
  2. 2. type of water pollution
  3. 3. a type of water pollution.
  4. 5. an animal that gets eaten
  5. 7. How clear the water is.
  6. 10. a symbiosis relationship