About earthquakes

Published: May 17 2011 05:15:22 PM EDT   Updated On: Apr 11 2012 09:31:20 AM EDT

Learn what causes earthquakes and look back at the biggest ones to ever rattle the U.S.

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Today's Clickers

20 scariest states in America

scared woman driving car

iStock/cookelma

Clowns, spiders and snakes, oh my! These states are the scariest in America, according to, well, Americans.

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