<P> 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 . Trace amounts of meteoric dust and variable amounts of volcanic ash also occur within pelagic sediments . Based upon the composition of the ooze, there are three main types of pelagic sediments: siliceous oozes, calcareous oozes, and red clays . </P> <P> The composition of pelagic sediments is controlled by three main factors . The first factor is the distance from major landmasses, which affects their dilution by terrigenous, or land - derived, sediment . The second factor is water depth, which affects the preservation of both siliceous and calcareous biogenic particles as they settle to the ocean bottom . The final factor is ocean fertility, which controls the amount of biogenic particles produced in surface waters . </P> <P> In case of marine sediments, ooze does not refer to a sediment's consistency, but to its composition, which directly reflects its origin . Ooze is pelagic sediment that consists of at least 30% of microscopic remains of either calcareous or siliceous planktonic debris organisms . The remainder typically consists almost entirely of clay minerals . As a result, the grain size of oozes is often bimodal with a well - defined biogenic silt - to sand - size fraction and siliciclastic clay - size fraction . Oozes can be defined by and classified according to the predominate organism that compose them . For example, there are diatom, coccolith, foraminifera, globigerina, pteropod, and radiolarian oozes . Oozes are also classified and named according to their mineralogy, i.e. calcareous or siliceous oozes . Whatever their composition, all oozes accumulate extremely slowly, at no more than a few centimeters per millennium . </P>

Which of the following factors affect the distribution of biogenic oozes on the seafloor
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