Rock Cavities (Stock Footage)

Rock Cavities (Stock Footage)

Abrasion is when material being transported wears away the bed and banks of the river channel. The intensity of abrasion depends on the hardness, concentration, velocity and mass of the moving particles. The Stone Age was a broad prehistoric period during which stone was widely used to make implements with an edge, a point, or a percussion surface. Neolithic house, archaeological features archaeology. Historic rock cavities cave cavern grotto.

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