Sedimentary rock

Sedimentary rock is a type of rock that is formed by sedimentation of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution. Particles that form a sedimentary rock by accumulating are called sediment. Before being deposited, sediment was formed by weathering and erosion in a source area, and then transported to the place of deposition by water, wind, mass movement or glaciers which are called agents of denudation.
The sedimentary rock cover of the continents of the Earth's crust is extensive, but the total contribution of sedimentary rocks is estimated to be only 5% of the total volume of the crust. Sedimentary rocks are only a thin veneer over a crust consisting mainly of igneous and metamorphic rocks.
Sedimentary rocks are deposited in layers as strata, forming a structure called bedding. The study of sedimentary rocks and rock strata provides information about the subsurface that is useful for civil engineering, for example in the construction of roads, houses, tunnels, canals or other constructions. Sedimentary rocks are also important sources of natural resources like coal, fossil fuels, drinking water or ores.
The study of the sequence of sedimentary rock strata is the main source for scientific knowledge about the Earth's history, including palaeogeography, paleoclimatology and the history of life.

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he rebellious tone and image of American rock and roll and blues musicians became popular with British youth in the late 1950s. While early commercial attempts to replicate American rock and roll failed, the trad jazz-inspired skiffle craze,[2] with its "do it yourself" attitude, was the starting point of several British acts that would later be part of the "invasion". Young British groups started to combine various British and American styles. This coalesced in Liverpool during 1962 in what became known as Merseybeat, hence the "beat boom".[3][4][5][6] In 1962 "Telstar", an instrumental by The Tornados became the first U.S. number 1 single by a British rock act.[7] Also that year the folk trio The Springfields featuring Dusty Springfield cracked the U.S. top 20.[8]

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