Ciencia humana

A beach is a landform along the shoreline of an ocean, sea, lake or river. It usually consists of loose particles which are often composed of rock, suchas sand, gravel, shingle, pebbles or cobblestones. The particles comprising the beach are occasionally biological in origin, such as mollusc shells or coralline algae.
Wild beaches are beaches which do not have lifeguards or trappings of modernitynearby, such as resorts and hotels. They are sometimes called undeclared, undeveloped or undiscovered beaches. Wild beaches can be valued for their untouched beauty and preserved nature. They are mostcommonly found in less developed areas including, for example, parts of Puerto Rico, the Dominican Republic, Thailand, the Philippines, and Indonesia.
Bangladesh is the home of the world's longestnatural sandy sea beach, located at Cox's Bazar.
Beaches typically occur in areas along the coast where wave or current action deposits and reworks sediments.
Overview
Although the seashore is mostcommonly associated with the word beach, beaches are found by lakes and alongside large rivers, as well as by the sea or oceans.
Beach may refer to:
small systems where rock material moves onshore,offshore, or alongshore by the forces of waves and currents; or
geological units of considerable size.
The former are described in detail below; the larger geological units are discussed elsewhereunder bars.
There are several conspicuous parts to a beach which relate to the processes that form and shape it. The part mostly above water (depending upon tide), and more or less actively influenced bythe waves at some point in the tide, is termed the beach berm. The berm is the deposit of material comprising the active shoreline. The berm has acrest (top) and a face — the latter being the slopeleading down towards the water from the crest. At the very bottom of the face, there may be a trough, and further seaward one or more long shore bars: slightly raised, underwater embankments...