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even know about. And the Earth isn't exactly settled itself. Every 24 hours, people experience

around 55 earthquakes a day, although most are ***** and the average person may not even

notice them. Tornadoes vary wildly by region, and some countries never see the whirling

cyclones, but in the US there's an average of more than two tornadoes a day, enough for

some places to build tornado cellars. Whether they're caused by climate, human negligence,