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15 cards from this deck
Weathering and mass movement
Breakdown of rock at valley sides whilst in place
Mechanical, chemical, and biological
Water in cracks freezes, expands, widens crack, rock breaks
9%
Loose rock fragments at base of slopes from freeze-thaw
Changes the chemical composition of rock
Soft clay minerals
Plant roots physically & organic acids chemically
Downward movement of weathered material under gravity
Material moves down as gravity overcomes holding forces
After heavy rainfall when ground becomes saturated
River erodes bottom of valley slope making it unstable
Curved failure surface
Weathering weakens rock, mass movement transports it downhill
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