Who isn't afraid of being waken abruptly by a shaking building whose roof is caving in? Or a huge
tsunami sweeping though your town? Earthquakes are terrifying. But what exactly are they? Why do earthquakes happen?
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/IpWAdF2WEK4/what-is-an-earthquake
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