costal areas explain
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Coastal areas are commonly defined as the interface or transition areas between land and sea, including large inland lakes. Coastal areas are diverse in function and form, dynamic and do not lend themselves well to definition by strict spatial boundaries. Unlike watersheds, there are no exact natural boundaries that unambiguously delineate coastal areas.
Geologically, continental margins are of two types: active margins where the edge of a continent happens to be at the edge of an oceanic plate (e.g. the west coast of South America); and inactive margins where the transition from continental lithosphere to oceanic lithosphere is within a plate rather than at a plate edge (e.g. the Atlantic). Coastal areas are therefore characterized by the vertical accretion of near-shore land. This depends on several factors: sediment supply from rivers or from the sea; the width of the shelf, or the proximity of a submarine canyon through which currents remove sediments; and the strength of longshore currents and incidence of cyclones, both of which transport and redistribute sediments along the coast. Sedimentation is the major geological activity that shapes coasts, but human-induced land subsidence is having an increasing impact on coastal morphology.
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Geologically, continental margins are of two types: active margins where the edge of a continent happens to be at the edge of an oceanic plate (e.g. the west coast of South America); and inactive margins where the transition from continental lithosphere to oceanic lithosphere is within a plate rather than at a plate edge (e.g. the Atlantic). Coastal areas are therefore characterized by the vertical accretion of near-shore land. This depends on several factors: sediment supply from rivers or from the sea; the width of the shelf, or the proximity of a submarine canyon through which currents remove sediments; and the strength of longshore currents and incidence of cyclones, both of which transport and redistribute sediments along the coast. Sedimentation is the major geological activity that shapes coasts, but human-induced land subsidence is having an increasing impact on coastal morphology.
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