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of chemicals within the sea water itself, including some from outer space. There are four basic types of sediment of the sea floor:
# Terrigenous (also lithogenous) describes the sediment from continents eroded by rain, rivers, and glaciers, as well as sediment blown into the ocean by the wind, such as dust and volcanic ash.
# Biogenous material is the sediment made up of the hard parts of sea creatures, mainly phytoplankton, that accumulate on the bottom of the ocean.
# Hydrogenous sediment

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