Weathering - University of Washington
Weathering
Weathering: the disintegration,
or breakdown of rock material
Mechanical Weathering: no change in
chemical composition--just
disintegration into smaller pieces
Chemical Weathering: breakdown as a
result of chemical reactions
CaCO3+CO2+H2O ---> Ca2+ + 2HCO3-
Mechanical Weathering
Physical breakup
? pressure release
? water: freeze - thaw cycles
? crystallization of salt in cracks
? thermal expansion and contraction
All this increases the total surface area
exposed to weathering processes.
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