Disintegration or decay of rocks in their original place at or close to ground surface. Largely caused by elements of weather such as rainfall or changes in temperature. Affects natural outcrops of rock as well as manmade structures causing small pits, flaking and discolouration.
Mechanical - aka physical, disintegration of rocks without change in chemicals, results in angular rock fragments called scree found at foot of bare rocky outcrops.
Chemical - chemical change occurs, slightly acidic rainwater dissolves certain rocks and minerals, those unaffected left behind to form clay deposit.
Biological - actions of flora and fauna, plant roots effective at growing and expanding in cracks in rocks, rabbits effective in burrowing into weak rocks like sand.
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