. The Earth beneath the sea : History . Fig. 6. Lutite {25%; 9: marshes. is always much poorer than on beaches and in submarine sands on the shelf where strong currents act upon them. In deltas, the sorting is also poor, and the grain size is even more variable than in estuaries: the sediments can include large pebbles in Mediterranean deltas, such as the Var delta in south-east France, while in the Mississippi delta the coarser fraction consists of fine sand. On the other hand, the particles are not the same in all parts of the deltas, since they depend on the processes of deposition (see bel
. The Earth beneath the sea : History . Fig. 6. Lutite {25%; 9: marshes. is always much poorer than on beaches and in submarine sands on the shelf where strong currents act upon them. In deltas, the sorting is also poor, and the grain size is even more variable than in estuaries: the sediments can include large pebbles in Mediterranean deltas, such as the Var delta in south-east France, while in the Mississippi delta the coarser fraction consists of fine sand. On the other hand, the particles are not the same in all parts of the deltas, since they depend on the processes of deposition (see below). Estuarine and deltaic sediments also contain an organic fraction, consisting of algal particles, small pieces of roots, remnants of planktonic animals, and so on. The organic fraction sometimes constitutes a large volume, and it leads, either in fresh or in salt water, to the formation of suspended flakes in which
Size: 2514px × 1988px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
