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Categorii: Tot - rivers - hydraulic - erosion

realizată de Joe Hall 7 ani în urmă

143

Rivers & Coasts

The processes of erosion, particularly abrasion and hydraulic action, significantly shape the landscapes of rivers and coasts. Abrasion involves rocks and stones embedded in glaciers scraping against bedrock and rock faces, resulting in smooth, polished surfaces often marked with striations.

Rivers & Coasts

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Rivers & Coasts

Rivers

Famous Rivers

Zambezi

Rhine

Volga

Danube

Amazon

Mississippi

Nile

Yangtze

Ganges

Main topic

Erosion

Abrasion

Abrasion occurs when rocks and stones become embedded in the base and sides of the glacier. These are then rubbed against the bedrock (at the bottom of the glacier) and rock faces (at the sides of the glacier) as the glacier moves. This causes the wearing away of the landscape as the glacier behaves like sandpaper. It leaves behind smooth polished surfaces which may have scratches in them called striations. Striations are carved out by angular debris embedded in the base of the glacier.

Hydraulic Action

Hydraulic action is erosion that occurs when the motion of water against a rock surface produces mechanical weathering. Most generally, it is the ability of moving water (flowing or waves) to dislodge and transport rock particles.

Coasts