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The Science Insider
Jason Lindsey

What Causes an Earthquake?

Posted Friday, April 18, 2008, at 12:17 PM
An earthquake occurs when two pieces of the earth slip past each other. The result is a violent shaking of the ground. According to the USGS there is an estimated 500,000 detectable earthquakes in the world each year. 100,000 of those can be felt, and 100 of them cause damage...
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