EESA06H3 Chapter Notes -Convergent Boundary, Strike And Dip, Compressive Stress

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Structural geology: branch of geology concerned with the shapes, arrangement, and interrelationships of bedrock units and the forces that cause them. Tectonic forces move and deform parts of the lithosphere, especially along plate margins. Deformation may cause change in orientation, location, and shape of a rock body. Stress expressed as the force per unit area at a particular point: hard to measure stress in rocks that are currently buried. We can observe effects of past stress when rock bodies are exposed after uplift and erosion. Strain is the change in size (volume) or shape, or both, in response to stress. Pushed together or squeezed from opposite directions compressive stress: common along convergent plate boundaries and typically results in rocks being deformed by a shortening strain. Rocks that have been shortened or flattened are typically found along convergent plate boundaries where rocks have been pushed or shoved together.

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