Low Temperature
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The pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom of the sea. It includes the sediment surface and some subsurface layers. Marine organisms living in this zone, such as clams and crabs, are called benthos.
Forms by subduction, when two or more of earths tectonic plates converge. The denser plate is pushed under the lighter plate.
