Gravel is rock that is of a certain range of particle size. In particular, there is loose rock that is greater than 2 mm (0.079 inch) in its smaller size (about 1 / 12 of an inch) and not exceeding 64 mm (2.5 in). The next smaller size class in geology is sand, which is> 0.0625 to 2 mm (, 0025 -, 0787 a) in size. The next larger size is the pebble, the> 64-256 mm (2.5 to 10.1 in). gravel can be divided into granular form specified (> 2-4 mm/0.079 0.16a) and gravel (> 4-64 mm/0.16 to 2.5 in). A cubic meter of gravel typically weighs about 3,000 pounds (or one cubic meter is about 1,800 kg).
Gravel is an important commercial product, with a range of applications. Many gravel roads have emerged, especially in rural areas where there is little traffic. Russia has just over 400,000 kilometers (250,000 miles) of dirt roads to the surface, the world is much more than dirt roads with asphalt or concrete surfaced. Both sand andsmall pebbles are also important for the production of concrete.
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