Composition of the Seafloor

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Presentation transcript:

Composition of the Seafloor Types of Sediment

Four types of sediments The ocean floor is composed of basaltic rock that is covered by sediment. Hydrogenous sediments Biogenous sediments Terrigenous sediments Cosmogenous sediments

Hydrogenous Sediments Result from _____________reactions within seawater The reactions cause minerals to come out of solution and form particles that settle on the bottom Sources include the dissolution of submerged ________and ____________, materials coming from new _________ forming at mid-ocean ridges, chemicals dissolved in _____________ vent water and material dissolved in

Biogenous Sediments Biogenous sediments originate from _____________ Primarily deepwater sediments The particles come from shell and hard skeletons Majority come from _____________organisms that contain silica (siliceous) or calicum carbonate (calcareous) Over time, biogenous sediments become ______________ and ______________

Calcareous ooze

Terrigenous Sediments Terrigenous sediments come from the _________ Result primarily from erosion by water, wind, and ice Deposited primarily on the continental shelves

Cosmogenous Sediments Cosmogenous sediments come from ____________ __________(cosmic dust) May contain microtektites, which are glass particles that form when a large meterorite impacts Earth Cosmogenous sediments are the ____________ abundant of the sediments