Sediment 07
Sediment 07 : Matter that setties to the bottom of the sea. Sediments were first seriously sampled by Matthew Maury, and systematically studied by the Challenger expedition (1872-1876). They are divided into two large groups, the terrigenous and the pelagic. The former is largely of terrestrial origin and consists of rock, gravel, sand, and mud: with volcanic intrusion, and coral debris. The pelagic sediments are those that "rain down" from all levels of the water and finally land on the bottom. These are the shells or skeletal remains of plankton
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