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Sea floor sediments and characteristics quizlet.
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And commonly an external shell called a test of diverse forms and materials tests of chitin found in some simple genera.
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Foraminifera f ə ˌ r æ m ə ˈ n ɪ f ə r ə.
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Terrigenous pelagic and hydrogenous.
However very little lithogenous sediments travel out to the deep ocean leaving the accumulation of biogenous sediments more available on the pelagic sea floor.
While most biology is found nearshore most of the nearshore biogenous sediments are watered down with the vast amount of neritic sediments and are hard to find in abundance nearshore.
The oldest sediments so far recovered by a variety of methods including coring dredging and deep sea drilling date only to the jurassic period not exceeding about 200 million years in age.
Measurements of the thickness of marine sediments and absolute age determinations of such bottom material have provided additional evidence for seafloor spreading.
It is further contoured by strong currents along the continental rise.
The sea floor and its sediments.
Informally called forams are single celled organisms members of a phylum or class of amoeboid protists characterized by streaming granular ectoplasm for catching food and other uses.
Sediments that accumulate on the seafloor provide information about ocean conditions at the time that the sediment was deposited changes in the composition of the seafloor sediment reflect changes in the depositional environment.
The sea floor and its sediments.
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Terrigenous sediment is derived from land and usually deposited on the continental shelf continental rise and abyssal plain.
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There are three kinds of sea floor sediment.
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