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continental shelf

rims the land, coral and other plants and seaweeds found here because it is shallower water and sun shines through for energy.

continental slope

drop to the sea floor

salt in the ocean

adds bouyancy

increasing depth

increasing darkness, increasing pressure, decreasing temperature, change in animal species, decreasing number and variety of plant life.

what happens to o2 in water

it is disolved


underwater valley

hydrothermal vents

high water temperature, chemosynthesis provides energy for bacteria


formed when volcanoes break the water surface

microscopic phytoplankton

start many foodchains (photosynthesis)

light zone

200 meters and up

dark zone

200 meters and down

ocean floor

usually flat, covered in sand, mud, decaying plants and animals, rock, and shipwrecks!

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