NOVA

Season 42 Episode 13

Sinkholes: Buried Alive

Aired Wednesday 9:00 PM Jan 28, 2015 on PBS
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Sinkholes are examined. The collapses can be gradual or sudden; and occur when carbon dioxide in the air dissolves in rainwater and forms a weak acid that weakens limestone and other water-soluble rocks beneath the soil. Included: video of dramatic collapses.

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