23PlanGeol-4 - tectonics Compression Extension Convection...

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Extension Compression Convection of the mantle creates stresses in the crust tectonics Tectonics Deformation of the crust – Compression: Stresses push the crust together • Mountains, ridges, etc. – Extension: Stresses pull the crust apart • Valleys, cracks Present on all planets – Earth has special case: • Plate Tectonics Faults Faults are where the crust fails, causing deformation Normal (extension) Thrust (compression) Strike-slip (shearing)
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