Weathering Processes - Geography 0.0 / 5 ? GeographyCoastal zonesGCSEOCR Created by: bbaitonCreated on: 18-01-18 19:14 Freeze-thaw Water collects in cracks or holes (pores) in the rock. At night this water freezes and expands and makes cracks in the rock bigger. When the temperature rises and the ice thaws, water will seep deeper into the rock. After repeated freezing and thawing, fragments of rock may break off and fall to the foot of the cliff (scree) 1 of 3 Salt Weathering Seawater contains salt. When the water evaporates it leaves behind salt crystals. In cracks and holes these salt crystals grow and expand This puts pressure on the rocks and flakes may eventually break off. 2 of 3 Carbonation Rainwater absorbs CO2 from the air and becomes slightly acidic. Contact with alkaline rocks such as chalk and limestone produces a chemical reaction causing the rocks to slowly dissolve. 3 of 3
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