Melting glaciers may lead to an increase in volcanic eruptions, earthquakes, and tsunamis.
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On December 26, 2004, an earthquake in the Indian Ocean off the coast of Indonesia created a wave of tsunamis that killed more than 175,000 people and left thousands without homes.
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Records of prehistoric tsunamis for the Pacific West Coast of Canada and USA prior to 1700 AD are extremely fragmentary.
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This site also provides a series of links focusing on tsunamis and volcanic hazards.