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Across 2. ________ are the organisms which live on, in, or near the seabed, also known as the benthic zone. 5. The world gets energy from these 8. __________ salts 10. Discovered in 1810 by Sir Humphery Davy 11. ______ is the biological conversion of 1 or more carbon molecules and nutrients into organic matter using the oxidation of inorganic molecules 14. A place in the ocean where a variety of aquatic life forms live 15. _________ is a layer within a body of water or air where the temperature changes rapidly with depth. 16. Another word for food chain 17. _____ _____ is the depth of the water whether in a lake or an ocean, that is exposed to sufficient sunlight for photosynthesis to occur 18. _______ is a rapid change in water density with depth. 19. Rock concretions on the sea bottom 21. _________ are any drifting organism that inhabits the pelagic zone of oceans, seas, or bodies of fresh water.

Down 1. A _____ ______ is a fissure in a planet's surface from which geothermally heated water issues 3. Trophic dynamics is the system of _______ 4. The ratio of the amount of matter in an object compared to its volume 6. ________ is the saltiness or dissolved salt content of a body of water 7. ______ is the conversion of light energy into chemical energy by living organisms 9. _______ _______ is the pelagic zone that contains the very deep benthic communities near the bottom of oceans 12. ____ ____ is a layer in which active turbulence has homogenized some range of depths 13. ________ also called food webs, food networks and/or trophic networks 20. _______ is a grouping of living organisms that live in the water column of the ocean and freshwater lakes.