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Apr 24, 2024 · The main features of the Pacific Ocean floor are the continental slopes, which drop from about 200 meters to several thousand meters over a distance of a few hundred kilometers, the abyssal plains—exceedingly flat and from 4,000 meters to 6,000 meters deep, volcanic seamounts and islands, and trenches at subduction zones that are up to 11,000 ...
Pelagic zone, ecological realm that includes the entire ocean water column. Of all the inhabited Earth environments, the pelagic zone has the largest volume, 1,370,000,000 kilometers (330,000,000 cubic miles), and the greatest vertical range, 11,000 meters (36,000 feet).
- The Editors of Encyclopaedia Britannica
People also ask
What is pelagic sediment?
What is the floor of the Pacific Ocean like?
What is a pelagic zone?
What is pelagic carbonate sediment made out of?
Apr 24, 2024 · Pelagic carbonate sediment is derived from organisms (e.g., foraminifera) living in the ocean water (at various depths, but mostly near surface) that make their shells (a.k.a. tests) out of carbonate minerals such as calcite.
Pelagic carbonate sediment is derived from organisms (e.g., foraminifera) living in the ocean water (at various depths, but mostly near surface) that make their shells (a.k.a. tests) out of carbonate minerals such as calcite.
- Steven Earle
- 2015
- Pelagic. This zone, also known as the open ocean, is comprised of oceanic water that is not in direct contact with the shore or sea floor. The pelagic zone is subdivided into vertical zones, based on factors such as sunlight amount.
- Epipelagic. This zone, known as the “sunlit” zone, begins on the surface of the water and extends to the dark, sunlight-less area where photosynthesis ceases in production.
- Mesopelagic. The mesopelagic zone reaches 200-1000m in depth. Technical deep-sea divers reach the 300m mark (National Weather Service). The mesopelagic zone is home to some of the most diverse fishes and behaviors.
- Bathypelagic. The bathypelagic zone is known as the “midnight” zone for its characteristically lightless waters. At 1,000-4,000 meters below, no light is able to penetrate the ocean water this deep, preventing any primary production.
Pelagic sediment or pelagite is a fine-grained sediment that accumulates as the result of the settling of particles to the floor of the open ocean, far from land. These particles consist primarily of either the microscopic, calcareous or siliceous shells of phytoplankton or zooplankton; clay -size siliciclastic sediment; or some mixture of these.
The ocean floor is almost entirely underlain by mafic oceanic crust (mostly basalt and gabbro, as described in more detail below), while the continental slopes are underlain by felsic continental crust (mostly granitic and sedimentary rocks).
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