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Weathering - Process which acts at the earth's surface to decompose and breakdown rocks
Erosion - The physical movement of weathered rock from its original site Primary agents are gravity, wind, water…
Mechanical or Physical - the breakdown of rock material into smaller pieces without changing the chemical composition
Chemical - the breakdown of rocks by chemical agents
Biological- when plant or animal life causes the breakdown of the rock
Expansion and Contraction - the thermal heating and cooling of rocks
Frost Action - Water freezes at night and expands because the solid occupies greater volume. Action wedges the rocks apart.
Exfoliation - process in which curved plates of rock are stripped from a larger rock mass.
Other types - Cracking of rocks by plant roots and burrowing animals.
Rock Composition- Some rock types are more likely to resist weathering while others are more vulnerable to it
Rock Properties- Properties that make it easier for water to infiltrate a rock make it more vulnerable to weathering
Climate- Some weathering processes cannot occur in certain climate zones
Not all rocks weather at the same rate
Some rocks are harder than othersEx: Quartz is more
resistant to chemical and physical weathering
Results in cross-cutting
Deposition – when the sediment is deposited and left to settle
Lithification Compaction - Squeezing out of waterCementation - chemical cement is formedRecrystallization - Growth of crystal in the
sediment
http://www.youtube.com/watch?v=lyysL02ZvQ8