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It's my understanding that there are techtonic plates within the earth's crust that will occasionally shift and cause geological disturbances. Volcanoes erupt when the shifts are deep enough to disturb the earth's core and superheated lava escapes through tunnels like "sink holes" to the surface. Likewise, a shift may result in other shifts making the terrain unstable resulting in an "earthquake" Frodo

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14y ago

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