What is caverns ? what is Swallow Holes ? Describe sink holes .
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A sinkhole, also known as a cenote, sink, sink-hole, swallet, swallow hole, or doline (the different terms for sinkholes are often used interchangeably), is a depression or hole in the ground caused by some form of collapse of the surface layer. ... Sinkholes may form gradually or suddenly, and are found worldwide.
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