The type of sediment that is made up mainly of the shells of diatoms and radiolarians are called the siliceous ooze<span>. Siliceous ooze is a siliceous pelagic sediment that covers large areas of the deep ocean floor. Calcareous ooze, siliceous ooze is formed from the tests of microorganisms; in the case of siliceous ooze, the organisms come in two varieties, diatoms and radiolarians. </span>
A caldera is a large depression formed when a volcano erupts and collapses. During a volcanic eruption, magma present in the magma chamber underneath the volcano is expelled, often forcefully. When the magma chamber empties, the support that the magma had provided inside the chamber disappears.
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B. Population size is the total number of organisms, while population density is the total number of organisms within a given area.
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Andes high mountains
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from Peru to Patagonia (Chile/Argentina)
