http://oceanexplorer.noaa.gov/facts/plate-boundaries.html
http://cnx.org/content/m23166/latest/
(Pearsons Education Limited: 'Edexcel Specification GCE Geography' 2013)
(AS Geography for Edexcel, Digby et al, 2008)
http://www.scribd.com/doc/14343088/Global-Hazards-Edexcel-AS-Revision
http://volcanoes.usgs.gov/images/pglossary/EruptionCloud.php
(http://www.crew.org/earthquake-information/earthquake-hazards)
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