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NOVA: Sinkholes - Buried Alive [DVD] [English] [2015]

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NOVA: Sinkholes - Buried Alive
A documentary about sinkholes that details how these collapses can be gradual or sudden, and occur when carbon dioxide in the air dissolves in rainwater and forms an acid that weakens limestone and other water-soluble rocks beneath the soil. ~ Perry Seibert, Rovi

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