What is a Beach?
A beach is a narrow, gently sloping strip of land that lies along the edge of an ocean, lake or river.beach It is a natural feature that can be found at many latitudes and is composed of loose materials like sand, pebbles, rock fragments and sometimes shells. Beaches are constantly changing as tides and waves deposit new materials and remove others. They can even be nourished artificially by the pumping of sand into areas that are losing their own. Beach nourishment may seem to be unnatural but the resulting beaches look quite natural and are often mistaken as naturally occurring by visitors.
Beaches are an important natural habitat that supports a diverse community of plants and animals.beach They provide shelter for intertidal animals such as hermit crabs and shellfish that burrow into the sand, or sea grasses and shorebirds that nest in the sand dunes. Beaches can also support wildlife that roams the coastline including sea turtles, migratory birds and mammals like dolphins and seals.
The formation of a beach begins with weathering, which is the breaking down of rocks by wind and water over a long period of time.beach This erosion eventually wears away the rocky material until only sand is left. The sandy surface of a beach can be composed of different types of sediment, depending on the geologic history of a region. For example, volcanic sands are jet-black while those on coral reefs are a beautiful green. Beaches can also be cemented by calcium carbonate which precipitates from the groundwater.
Waves and currents continuously transport sand and other loose sediments toward the shoreline where they deposit them as a beach.beach These sediments may come from eroded rocks offshore, or they may be carried there by longshore currents and the ebb and flow of the tide. Sands in temperate latitudes are mostly quartz with a small percentage of feldspar, while those in the tropics are typically calcareous, containing skeletal remains of marine organisms and oolites.
Some beaches are formed by the accumulation of sediments in sheltered bays or lagoons, while others are made up of open-ocean sand bars and troughs.beach Bars can be shaped into crescent-like features called groynes or sandbars, and are more pronounced in high seas than during gentle seas when their power is reduced.
Beaches are a fascinating natural feature that can be seen around the world, and they play an important role in the lives of humans as a source of recreation, relaxation and a place to gather for social events. They can be used as playgrounds, places for sport and fishing, and are home to an incredible diversity of living things from tiny hermit crabs to colorful fish. Beaches are a natural treasure and we should protect them as best we can. This means keeping them free from litter and making sure they are not altered by human activity. When humans do alter a beach, such as by building structures like groynes, it can affect the health and longevity of the beach.