Ocean Floor Features
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that portion of the seafloor adjacent to the continents; icludes the continental rise, continental slope, and continental shelf
continental margin
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the gently sloping submerged portion of the continental margin, extending from the shoreline to the continental slope
continental shelf
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the steep gradient that leads to the deep-ocean floor and marks the seaward edge of the continental shelf
continental slope
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a seaward extension of a valley that was cut on the continental shelf during a time when sea level was lower; a caynon carved into the outer continental shelf, continental slope, and continental rise by turbidity currents
submarine canyon
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a down slope movement of dense, sediment-laden water created when sand and mud on the continental shelf and continental slope are dislodged and thrown into suspension
turbidity current
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the gently sloping surface at the base of the continental slope
continental rise
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area of the deep-ocean floor between the continental margin and the oceanic ridge
ocean basin floor
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very level area of the deep-ocean floor, usually lying at the foot of the continental rise
abbysal plains
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an isolated volcanic peak that rises at least 1,000 meter above the deep-ocean floor
seamount
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a continuous elevated zone on the floor of all the major ocean basins and varying in width from 1,000 to 4,000 kilometers; the rifts at the crests of ridges represent divergent plate boundaries
mid-ocean ridge
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the process by which plate tectonics produces new oceanic lithosphere at ocean ridges
seafloor spreading