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VOLCANOES are formed when magma from the Earth's upper mantle works its way to the surface.Earthquake is the perceptible shaking of the surface of the Earth, which can be violent enough to destroy major buildings and Houses..Mountain Rangers organized as an independent military company, the only one in Southern Oregon..Epicenter  is the point on the Earth's surface that is directly above the focus, the point where an EARTHQUAKE or underground explosion(VOLCANIC ERUPTION) originates.