Friction, Force that causes resistance to movement between two layers, Elastic Energy, Stored energy that builds up in a rock as it gets compressed or stretched, Kinetic Energy, Energy of moving objects this gets released when the rock reaches its elastic limit, Seismic Waves, Waves of energy released when a rock fractures, Fault Scarp, Shelf of exposed rock above a fault line, Focus, Actual location inside the crust where the rock has fractured, Epicenter, Location directly above the focus on Earth's surface, Hanging Wall, Block of rock that sits on TOP of a fault, Foot Wall, Block of rock that sits UNDER a fault, Normal Fault, When the hanging wall gets pulled downwards relative to the foot wall, Reverse Fault, When the hanging wall gets pushed upwnwards relative to the foot wall, Strike-Slip Fault, When two blocks of rock try to slide past one another horizontally, Compression, When two blocks of rock get pushed together they experience this kind of force, Tension, When two blocks of rock get pulled apart they experience this kind of force, Shear, When two blocks of rock slide past horizontally in opposing directions they experience this kind of force, Fault, Fracture in the crust caused by the sudden release of elastic energy stored while the rock experiences push/pull

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