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.
In contrast, Sand as unconsolidated sediment at the surface are more than one million years. As a special case of sands can be seen that has arisen from the calcium carbonate skeletons of dead marine creatures, such as sea shells or corals. Considered in geological time scales, this sands are very short-lived, since the individual grains are usually changed so much during diagenesis that they can not be removed inir original form after a new uplift and erosion.
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.
Stepping volcanic islands of sands that have resulted from physical weathering of volcanic rocks. These include the greenish olivine and the dark basalt sands on the Hawaiian Islands. Basalt sands there, other than olivine or silica sands, due to microscopic size of mineral grains of basalt not to individual mineral grains, but from sands-grain-sized rock fragments.
Since the interior surface of a given volume of sand is greater than an equally large boulder weathering and erosion can start better for small grains, so that change particle size, particle shape and mineral composition of sands comparatively (as seen in geological time) quickly. The result of small grains even smaller by using smaller fragments are broken split along crystal boundaries or by collisions during transport.
Sharp sand is much more compact, both in sedimentation as well as in building materials, because tilting the grains. But they can be bad mix and weigh all the tools enormous. Blown sands are called the result of its purity, its small particle size and its good sorting through the wind very easily movable sands. If wide occurrence it occurs often in form of dunes in appearance.
Sands is a sedimentary and can thus be found mainly in sedimentary basins. In high mountains, a pronounced erosion area, sandsy is therefore only found sporadically, particularly in valley glaciers and moraines of deposits in river. Medium mountain but mainly in lowlands, however, large quantities of sands are transported and sedimented by meandering rivers.
It is therefore often used as a raw material in construction industry or for the production of concrete. In sands pits mined material must usually be washed, because clay and organic matter have enriched. Predominantly calcareous sands from the Kalalau beach on Kauai, Hawaii Islands, with coral fragments and but also olivine (green) and basalt grains (dark). The image width is 5.5 mm.
In contrast, Sand as unconsolidated sediment at the surface are more than one million years. As a special case of sands can be seen that has arisen from the calcium carbonate skeletons of dead marine creatures, such as sea shells or corals. Considered in geological time scales, this sands are very short-lived, since the individual grains are usually changed so much during diagenesis that they can not be removed inir original form after a new uplift and erosion.
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.
Stepping volcanic islands of sands that have resulted from physical weathering of volcanic rocks. These include the greenish olivine and the dark basalt sands on the Hawaiian Islands. Basalt sands there, other than olivine or silica sands, due to microscopic size of mineral grains of basalt not to individual mineral grains, but from sands-grain-sized rock fragments.
Since the interior surface of a given volume of sand is greater than an equally large boulder weathering and erosion can start better for small grains, so that change particle size, particle shape and mineral composition of sands comparatively (as seen in geological time) quickly. The result of small grains even smaller by using smaller fragments are broken split along crystal boundaries or by collisions during transport.
Sharp sand is much more compact, both in sedimentation as well as in building materials, because tilting the grains. But they can be bad mix and weigh all the tools enormous. Blown sands are called the result of its purity, its small particle size and its good sorting through the wind very easily movable sands. If wide occurrence it occurs often in form of dunes in appearance.
Sands is a sedimentary and can thus be found mainly in sedimentary basins. In high mountains, a pronounced erosion area, sandsy is therefore only found sporadically, particularly in valley glaciers and moraines of deposits in river. Medium mountain but mainly in lowlands, however, large quantities of sands are transported and sedimented by meandering rivers.
It is therefore often used as a raw material in construction industry or for the production of concrete. In sands pits mined material must usually be washed, because clay and organic matter have enriched. Predominantly calcareous sands from the Kalalau beach on Kauai, Hawaii Islands, with coral fragments and but also olivine (green) and basalt grains (dark). The image width is 5.5 mm.
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