Sands are a naturally occurring, unconsolidated sediment that consists of individual mineral grains with a grain size of 0.063 to 2 mm. They are coarser than silt so (grain size from 0.002 to 0.063 mm) and finer than gravel (grain size 2 to 63 mm). Sands are also one of non-cohesive soils - sand and gravel Lynnwood. The term "sands" is not dependent on the mineral composition. The vast majority of all Sandse, however, the majority of quartz grains.
Above all, this quartz sand is an important raw material for the construction industry as well as for the glass and semiconductor industry. The first sands the Earth's history originated from igneous and metamorphic rocks (eg. As granite or gneiss), which were divided by physical weathering into smaller blocks or caused by chemical weathering according prone rock components directly into individual mineral grains.
Carbon sands are named after their main component of calcium carbonate (CaCO3), is found mainly on the beaches of islands with pre-coral reef. They are therefore back reef sands or, because ofir relatively high proportion of coral fragments, known colloquially as "coral sands". Even without a coral reef, under certain conditions, eg. As in absence of silica sands, beaches relatively pure, then mostly of more or less rounded fragments of, accumulate, known colloquially as "shell sands". But also come in quartz-dominated marine beach sands are common.
Coarse silt and sands are designated according to classification under From Engelhardt since 1953 as Psammite (as opposed to more fine-grained pelites). Coarser sands are called in North Germany Grand, a term that is also used in classification by von Engelhardt for a grain size range covers most of fine gravel class to DIN standard. Sands, mainly consisting of grains of a grain size, are called well sorted; are in accordance with poorly sorted sands those in which a wide range of grain sizes is represented.
Since the Hawaiian Islands are of volcanic origin and both surrounded by reefs, come on their beaches also mixed carbonate-volcanic sands before. In extremely dry regions of earth and sands from relatively readily water-soluble minerals may occur. An example of this is the fine plaster sands, forming the white dunes of White Sands National Monument in Chihuahua Desert in New Mexico.
Some minerals are (considered in geological time) under atmospheric influence relatively quickly chemically converted into clay minerals or completely dissolved (feldspars, mafic minerals or carbonates), so that their share in total amount of sands compared to more chemically resistant minerals (eg. As quartz) decreases significantly.
By mechanical stress during transport, the shape of individual grains changes. In general, corners and edges are rounded and sandsed all the more so the longer the transit. However, this is not a linear process: The rounder and smaller the particles are, the more resistant they are against further changes. Investigations revealed that often a transport of thousands of kilometers is needed also to be rounded edged grains of sands medium size only moderate.
During transport along rivers this path lengths can be achieved only rarely, and the steady motions in surf zone of a coastal range in most cases is not sufficient to explain nowadays observable good rounding of many grains of sands, especially not when the sands mainly is made of durable quartz. This is explained by the fact that the vast majority of today occurring on earth sands weathering of sandstone comes and thus already has multiple erosion and sedimentation cycles behind: sands is deposited (sediment), covered by other sediments, thereby compacting. The sands grains are finally cemented together by a binder during diagenesis and a sandstone is formed.
Above all, this quartz sand is an important raw material for the construction industry as well as for the glass and semiconductor industry. The first sands the Earth's history originated from igneous and metamorphic rocks (eg. As granite or gneiss), which were divided by physical weathering into smaller blocks or caused by chemical weathering according prone rock components directly into individual mineral grains.
Carbon sands are named after their main component of calcium carbonate (CaCO3), is found mainly on the beaches of islands with pre-coral reef. They are therefore back reef sands or, because ofir relatively high proportion of coral fragments, known colloquially as "coral sands". Even without a coral reef, under certain conditions, eg. As in absence of silica sands, beaches relatively pure, then mostly of more or less rounded fragments of, accumulate, known colloquially as "shell sands". But also come in quartz-dominated marine beach sands are common.
Coarse silt and sands are designated according to classification under From Engelhardt since 1953 as Psammite (as opposed to more fine-grained pelites). Coarser sands are called in North Germany Grand, a term that is also used in classification by von Engelhardt for a grain size range covers most of fine gravel class to DIN standard. Sands, mainly consisting of grains of a grain size, are called well sorted; are in accordance with poorly sorted sands those in which a wide range of grain sizes is represented.
Since the Hawaiian Islands are of volcanic origin and both surrounded by reefs, come on their beaches also mixed carbonate-volcanic sands before. In extremely dry regions of earth and sands from relatively readily water-soluble minerals may occur. An example of this is the fine plaster sands, forming the white dunes of White Sands National Monument in Chihuahua Desert in New Mexico.
Some minerals are (considered in geological time) under atmospheric influence relatively quickly chemically converted into clay minerals or completely dissolved (feldspars, mafic minerals or carbonates), so that their share in total amount of sands compared to more chemically resistant minerals (eg. As quartz) decreases significantly.
By mechanical stress during transport, the shape of individual grains changes. In general, corners and edges are rounded and sandsed all the more so the longer the transit. However, this is not a linear process: The rounder and smaller the particles are, the more resistant they are against further changes. Investigations revealed that often a transport of thousands of kilometers is needed also to be rounded edged grains of sands medium size only moderate.
During transport along rivers this path lengths can be achieved only rarely, and the steady motions in surf zone of a coastal range in most cases is not sufficient to explain nowadays observable good rounding of many grains of sands, especially not when the sands mainly is made of durable quartz. This is explained by the fact that the vast majority of today occurring on earth sands weathering of sandstone comes and thus already has multiple erosion and sedimentation cycles behind: sands is deposited (sediment), covered by other sediments, thereby compacting. The sands grains are finally cemented together by a binder during diagenesis and a sandstone is formed.
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