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A pile of rock fragments that include size classes from granule, to boulder-sized fragments, similar in particle size range, are known as gravel, and it can be defined by the Udden-Wentworth scale as:smaller - granular gravel, with particle size from 2 to 4 mm, and bigger - pebble gravel, with particle size from 4 to 64 mm. One cubic yard of gravel typically weighs about 3000 pounds. With numerous applications, gravel represents a very important commercial product. In rural areas, where traffic is not that frequent, roads are covered with gravel, in order to prevent mud from appearing.In speaking in percentage, there are more roads on the earth that are covered with gravel than the tarmac roads. Only in Russia, you can find more than 400,000 km of gravel roads. Gravel, together with sand, are quite important for the production of concrete. Big gravel deposits are quite a usual geological appearance, due to the weather impact on the stones, and erosion. Ocean waves as well as rivers, can pile up huge deposits of gravel.Sometimes, gravel can be found compacted and concreted into the sedimentary rock, and this is known as gravel conglomerate. In the areas of the world where there aren’t enough natural gravel deposits,gravel can be produced by quarrying and crushing hard-wearing rocks like basalt, sandstone, or limestone. Quarries that are extracting gravel are called gravel pits. During the Ice Ages, a massive concentration of gravel deposits has been spread in the region of Southern England, making them one of the largest gravel exporters in the world.
There are 10 known types of gravel:
Fine gravel: This type consists particles that range from 2 to 4 mm.
Creek rock: This type comes with rounded, semi-polished stones, that are extracted from creek and river beds. It is mostly used as an aggregate for concrete.
Bank gravel: This type is found in natural deposits by the rivers or streams. It comes as a mixture of gravel and clay, gravel and sand.
Bench gravel: Deposit of gravel found on the side of a valley, above the river, meaning that the river bed used to be there, and that is how the gravel got there.
Crushed stone: As the names says, this type of gravel is made from crushed rocks, and then mixed into a blend of stones and fines. It can be made from limestone, granite, and dolomite.
Lag gravel: This type represents coarse gravel accumulated on the surface, after finer particles are removed.
Pay gravel: This type of gravel can likewise be called "pay dirt", and it represents gravel with a high concentration of gold and other precious metals,
and after the metals are removed, the gravel that remains is the Pay gravel.
Pea gravel: This type comes with small, rounded stones, and it is mostly used for concrete surfaces.
Piedmont gravel: This type represents gravel that was carried by the rivers, down the mountains, and was deposited on flat ground, where the water runs slower.
Plateau gravel: This type of gravel can be found in layers on a plateau above the height at which stream-terrace gravel can be found.
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