GEO 1111 Lecture Notes - Lecture 12: Silicate Minerals, Regolith, Calcite

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GEO 1111 Full Course Notes
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GEO 1111 Full Course Notes
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Weathering; involves physical breakdown and chemical alteration of rock at or near earth"s surface. Two types : mechanical weathering; physical forces breaking down rock into smaller pieces, chemical weathering; chemical transformation of rock into new compounds. As mechanical weathering breaks down rock into smaller pieces, more surface area is exposed to chemical weathering. Stress, diffusion, distillations, thermal regulation (heat loss and gain). Mechanical weathering: frost wedging: there are 2 different methods, biological activity: Plant roots grow into fractures in a rock, causing the cracks to expand. Burrowing animals break down rocks by moving fresh material to the surface, enhancing physical and chemical weathering. Water works in its way into the cracks of rocks and the freezing enlarges the cracks in the rocks. Lenses of ice grow larger as they attract liquid water from surrounding areas: sheeting/unloading: unloading leads to sheeting. Large masses of igneous rock are exposed by erosion and glaciation and concentric slabs break loose.

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