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

Massive sinkholes devour whole city blocks with no warning. People are almost buried alive. It's not just the stuff of horror movies - it can happen anywhere to anyone.

Massive sinkholes devour whole city blocks with no warning. People are almost buried alive. It's not just the stuff of horror movies - it can happen anywhere to anyone.

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