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• GeoHazards - Sinkholes
  A description of sinkholes, as well as potential problems associated with them.
• Sinkholes
  A definition of sinkholes with some nifty karst terrain maps.
• Sinkholes A description of how sinkholes form.
• Sinkholes A U.S.G.S. "Water Science for Schools " site, with a picture and description.
• What is a Sinkhole? Another picture of a few sinkholes, with definitions.

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