Gravel - rock, loose material, formed as a result of natural destruction (weathering) of solid rock.

Gravel consists of round grains of size 5-70 mm in diameter. Gravel may be a mountain (ovrazhnym), river and sea.

Mountain gravel has rough surface and usually contains impurities of sand, clay and organic matter. The river and the sea is cleaner gravel mining, but its grain has a smooth surface that impairs the adhesion of cement-sand mortar in the concrete.

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