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Originally Posted by Jetstream
And you say it was caused by rain?
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Mechanisms of formation may include the gradual removal of slightly soluble bedrock (such as limestone) by percolating water, the collapse of a cave roof, or a lowering of the water table.
...Sinkholes may capture surface drainage for running or a standing water, but may also form in currently high and dry locations.
http://en.wikipedia.org/wiki/Sinkhole