By: Caitlin McGlynn, David Wilker, and Courtney O’Brien.

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Presentation transcript:

By: Caitlin McGlynn, David Wilker, and Courtney O’Brien

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 others Ex: 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 water Cementation - chemical cement is formed Recrystallization - Growth of crystal in the sediment

Weathering.html Weathering.html uick/academy/weatherexp.html uick/academy/weatherexp.html “The Good Earth: Introduction to Earth Science” (pg )