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Unformatted text preview: : fracturing into thin slabs of rock parallel to its exposed surface Erosion by wind or water Abrasion by glaciers Abrasion by glaciers Biological activities actions of plants, animals actions of plants, animals 4.1 Weathering of materials 4 Weathering and erosion The progressive disintegration of a granite block of granite which “rots” gives a “ball“ and sand Physical disintegration of granite Physical weathering Physical disintegration of granite Physical weathering Heat causes Expansion; cooling causes contraction. Different minerals expand and contract at different rates, causing stresses along mineral boundaries. Repeated daily heating and cooling of rock causes the rock to break down....
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- Spring '11