How sink holes are formed

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How sink holes are formed
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Clip from Sinkholes: Swallowed Alive  |  National Geographic  |  August 29, 2016

This clip uses a simple experiment to show how natural sink holes form. A scientist uses a salt lick to demonstrate how water er

This clip uses a simple experiment to show how natural sink holes form. A scientist uses a salt lick to demonstrate how water er

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