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Coastal Geology Research PaperHuman activities are sometimes responsible for modification in the cycle of erosion and sedimentation as well as changing the course of rivers and the number of sediments that are carried into the sea. Besides erosion of rocks and cliffs, sediments are also created by currents that bring in substances from the seabed, and they are deposited and become a landform or are stored on offshore ledges. On the other hand, it flows with the water and rests in deeper waters some distance away from the embankments. Some sediment is termed clastic sediments which are from the rock being eroded. This is of many different sizes from fine clay to sand, gravel, shingle, and stones, and stands to the size of boulders. Biogenic sediments are the shells and skeletons of marine creatures. Human activities that affect changes in sediment flow and deposits are generally related to agriculture, cutting of forests, urbanization, and mining. Another important reason for the change in sediment patterns is because construction of huge tanks or lakes for storing water, dams, and causeways, and the dredging of massive irrigation schemes. Changes in erosion patterns and the effects that this will have will basically depend on whether the quantity of salt is increased or decreased. In both situations, different physical effects are evident regarding water quality, the chemical relation between cause and effect, and the well-being of the marine life Mostly the effects of sedimentation are restricted locally, but sometimes these strong effects cross international boundaries because currents near the shore carry silt across. Increased sedimentation results in the suffocating of fish and other forms of sea life, and in some instances completely covering up corals, mangroves, and seagrass beds, reduces the amount of sunlight that penetrates resulting in limiting the production of a photosynthetic organism of a group that lives mainly in water and includes the seaweeds (algae) and other forms of underwater vegetation, it hurts fish by grating and flushing out their gills.
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