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| the non-living factors of the environment that an organism lives in. |
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| mostly flat portion of ocean floor which provides a home to a variety of unique organisms that are adapted to the extreme conditions of this habitat. |
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| lowest layer of the ocean, where light does not reach. |
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| organisms that live on or in the ocean floor. |
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| the living organisms of the environment. |
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| feed on other organisms (plant or animal) because they cannot make their own food. |
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| extends from the edge of the continent outward to where the bottom sharply drops off into a steep slope. |
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| The steep incline between the continental shelf and the abyssal plain. |
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| a large portable container that divers can enter after they've surfaced to help their bodies return to normal atmospheric pressure |
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| Microscopic algae with plate-like structures composed of silica. |
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| A device used to determine depth by sound waves. |
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| A community of different but interdependent species and their non-living environment. |
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| body of water where a river meets the ocean |
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| A unit of measure for ocean depth. One fathom is 6 feet (1.83 meters). |
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| A hierarchy of food relationships from the simplest to most complex. |
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| The immediate space where an animal or plant lives and has food, water and protection. |
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| An opening in the sea floor where super-heated water and other material are discharged into the surrounding seawater. |
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| the area that lies between the low-tide and the high-tide line. |
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| A chain of undersea mountains that circles the earth through every ocean. |
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| the first 200 meters (656 feet) of ocean water, which includes the seashore and most of the continental shelf. |
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| the deepest parts of the ocean. The deepest one is the Marianas Trench (located in the South Pacific Ocean - almost 5 miles (8.05 kilometers) deep. |
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| Extends from 200 meters (656 feet) deep all the way down to the bottom of the ocean. |
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| The study and exploration of the world's ocean. |
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| The top layer of the ocean where sunlight penetrates. |
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| The plant and algae component of the plankton; the primary producers of most ocean food webs. |
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| a living thing that produces its own food within itself, usually by using sunlight energy in photosynthesis |
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| ROV (Remotely Operated Vehicle) |
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| Unmanned submersible tethered to a mother ship and operated by pilots using a joy stick. |
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| the amount of dissolved solids in seawater |
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| Self-Contained Underwater Breathing Apparatus - device that allows divers to breathe underwater for long periods of time. |
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| A volcanic peak that rises at least 3280 feet (1000 m) from the seafloor. |
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| SOund NAvigation Ranging - used to measure ocean depth by sending sound to bounce off the ocean floor. |
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| A small submarine used to explore the ocean depths; equipped with windows, lights, mechanical arms, cameras and other scientific instruments capable of seeing and recording data. |
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| the upward movement to the ocean surface of deeper, cold and usually nutrient-rich waters, especially along some shores, due to the offshore movement of surface waters |
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| Animal component of the plankton that feed on phytoplankton and other zooplankton (primary consumers). |
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