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| area of depth about 200 meters in the open ocean where light can penetrate |
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| area along the ocean floor that consists of sand, silt, and dead organisms |
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| deepest region of the ocean |
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| areas of land such as marshes, swamps, and bogs that re saturated with water and that support aquatic plants |
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| area that, because of tides, is alternately submerged and exposed; its the area where ocean water meets land |
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| open water area that is well lit and is dominated by plankton |
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| the part of a lake or pond that is the water closest to shore |
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| the deepest areas of a large lake; much colder and lower in oxygen than the other lake zone |
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| free-floating photosynthetic autotrophs that live in freshwater or marine ecosystems |
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| material that is deposited by water, wind or glaciers |
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| ecosystem that is formed where a freshwater river or stream merges with the ocean |
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| an area of the open ocean where sunlight is unable to penetrate |
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