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History
Marine sediment
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Marine sediment, or ocean sediment, or seafloor sediment, are deposits of insoluble particles that have accumulated on the seafloor. These particles either have their origins in soil and rocks and have been transported from the land to the sea, mainly by rivers but also by dust carried by wind and by the flow of glaciers into the sea, or they are biogenic deposits from marine organisms or from chemical precipitation in seawater, as well as from underwater volcanoes and meteorite debris.
Scanning electron micrograph showing grains of silica sand
Scanning electron micrograph showing grains of silica sand
The face of blue glacial ice melting into the sea
The face of blue glacial ice melting into the sea
River discharge in the Yukon Delta, Alaska. The pale color demonstrates the large amounts of sediment released into the ocean via the rivers.
River discharge in the Yukon Delta, Alaska. The pale color demonstrates the large amounts of sediment released into the ocean via the rivers.
A plume of wind-borne particles from Sudan (left) blow over the Red Sea
A plume of wind-borne particles from Sudan (left) blow over the Red Sea
Seabed
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The seabed is the bottom of the ocean. All floors of the ocean are known as 'seabeds'.
Common stingray foraging for invertebrates in seafloor sediment.
Common stingray foraging for invertebrates in seafloor sediment.
gravel seabed in Italy
gravel seabed in Italy
white sand seabed in Mexico
white sand seabed in Mexico
sand seabed in Greece
sand seabed in Greece