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Tags: karst

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  Sinkholes

  by Sandra Friend

  What is a sinkhole? Far from being just a hole in the ground, a sinkhole is a very special type of phenomenon. Born of the interaction between water and rock, sinkholes appear anywhere rock dissolves easily. Some sinkholes happen gradually, the ground inside them slowly sinking over hundreds of years. Other sinkholes open up almost instantly. These are the ones you hear about in the news—the sinkholes that... (more)