Unmanned submersible tethered to a mother ship and operated by pilots using a joy stick.

A device that allows divers to breathe underwater for long periods of time.

An opening in the sea floor where super-heated water and other material are discharged into the surrounding seawater.

A free-swimming organisms whose movements are independent of the tides, currents, and waves.

A body of water where a river meets the ocean.

Extends from the edge of the continent outward to where the bottom sharply drops off into a steep slope.

Organisms that live on or in the ocean floor.

The first 200 meters (656 feet) of ocean water, which includes the seashore and most of the continental shelf.

The top layer of the ocean where sunlight penetrates.

A living thing that produces its own food within itself, usually by using sunlight energy in photosynthesis

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