puzzle

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Across
  1. 1. attraction towards a specific object
  2. 5. a region seperated from it's surroundings by an energy boundry
  3. 6. warm, less dense water is drawn away and replaced by colder water
  4. 8. indicators for life
  5. 10. a movement of water down from the surface
  6. 11. cycle for nitrogen
  7. 13. area on ocean floor were methane seeps
  8. 16. an array of solar cells that generates power
  9. 18. a salt or ester of nitric acid
Down
  1. 1. a salt or ester of phosphoric acid
  2. 2. not biotic
  3. 3. using chemical reactions to produce energy
  4. 4. a region isolated by it's surroundings
  5. 7. animal like protists
  6. 9. group of atoms held together by covalent bonds
  7. 12. a photo cell where electromagnetic force is generated
  8. 14. a steam leading into a larger body of water
  9. 15. microorganisms
  10. 16. responsible overseeing of something important
  11. 17. living on the ground