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ExtensionCompressionConvection of the mantle createsstresses in the crusttectonicsTectonics•Deformation of the crust– Compression: Stresses push thecrust together• Mountains, ridges, etc.– Extension: Stresses pull the crustapart• Valleys, cracks•Present on all planets– Earth has special case:• Plate TectonicsFaultsFaults arewhere the crustfails, causingdeformationNormal(extension)Thrust(compression)Strike-slip(shearing)
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