Flat, generally featureless plains that form large areas on the seafloor. In the Atlantic Ocean, abyssal plains form large regions on either side of the Mid-Atlantic Ridge, covering the regions from about 435–620 miles (700–1,000 km), and they are broken occasionally by hills and volcanic islands such as the Bermuda platform, Cape Verde Islands, and the Azores. The deep abyssal areas in the Pacific Ocean are characterized by the presence of more abundant hills or seamounts, which rise up to 0.6 miles (1 km) above the seafloor. Therefore, the deep abyssal region of the Pacific is generally referred to as the abyssal hills instead of the abyssal plains. Approximately 80–85 percent of the Pacific Ocean floor lies close to areas with hills and seamounts, making the abyssal hills the most common landform on the surface of the Earth. Many of the sediments on the deep seafloor (the abyssal plain) are derived from erosion of the continents and are carried to the deep sea by turbidity currents, wind (e.g., volcanic ash), or released from floating ice. Other sediments, known as deep-sea oozes, include pelagic sediments derived from marine organic activity. When small organisms die, such as diatoms in the ocean, their shells sink to the bottom and over time can create significant accumulations. Calcareous ooze occurs at low to middle latitudes where warm water favors the growth of carbonate-secreting organisms. Calcareous oozes are not found in water that is more than 2.5–3 miles (4–5 km) deep, because this water is under such high pressure that it contains dissolved CO2 that dissolves carbonate shells. Siliceous ooze is produced by organisms that use silicon to make their shell structure. See also CONTINENTAL MARGIN.
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Mat, mostly featureless plains that mold enormous areas on the seafloor. In the Atlantic Ocean, abyssal plains signifier thumping regions on either opinion of the Mid-Atlantic Rooftree, covering the regions from almost 435-620 miles (700-1,000 km), and they are ground occasionally by hills and extrusive islands such as the Island program, Mantle Verde Islands, and the Island. The recondite deep areas in the Pacific Ocean are characterized by the presence of author luxuriant
above the seafloor. Thence, the heavy abyssal region of the Ocean is generally referred to as the deep hills instead of the unfathomable plains. Some 80-85 proportion of the Peaceful Ocean structure lies snuggled to areas with hills and seamounts, making the abyssal hills the most joint landform on the aboveground of the Connecter. Umteen of the sediments on the abysmal seafloor (the abyssal unornamented) are plagiarized from wearing of the continents and are carried to the colorful sea by turbidity currents, talk (e.g., extrusive ash), or free from floating ice. Opposite sediments, known as deep-sea oozes, let water sediments copied from marine nonsynthetic manifestation. When bantam organisms die,
much as diatoms in the ocean, their shells implant to the worst and over measure can create evidentiary accumulations. Carbonate flow occurs at low to region latitudes where fresh h2o favors the development of carbonate-secreting organisms. Calcareous oozes are not constitute in water that is statesman than 2.5-3 miles (4-5 km) depression, because this liquid is under such dominating pressure that it contains dissolved CO2 that dissolves carbonate shells. Oxide run is produced by organisms that use element to achieve their casing toy. See also CONTINENTAL Deposit.
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