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The image is from http://www.blindloop.com/wp-content/uploads/2010/04/Sinkhole.jpg. There are some other spectacular images at http://tinyurl.com/2942est.
News, web resources and links for geomorphic hazards, including processes, assessment methods and management. Hazards can include river and coastal flooding, karst hazards, soil erosion and land degradation, glacier hazards, jokulhlaups, permafrost and periglacial hazards, landsliding and slope instability.