This document discusses the classification and distribution of different types of marine sediments. Sediments are classified based on their origin as lithogenous (derived from land), biogenous (derived from organisms), hydrogenous (derived from water), or cosmogenous (derived from outer space). Lithogenous sediments include eroded rock fragments transported from land by rivers, wind, ice or gravity. Biogenous sediments consist of the hard remains of once-living organisms like shells. Hydrogenous sediments form as minerals precipitate directly from seawater, like manganese nodules. The distribution of sediments depends on factors like proximity to land, water depth, biological productivity and dissolution rates.