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What causes sinkholes ?


Another "giant" sinkhole just opened in Boston. What causes these frightening events?

 
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Best Answer John Connor (connorj) says

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2 years ago
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    Phyllis Doyle Burns (Phyllis Doyle) 2 years ago

    Wow ! I never knew all this. Thanks for the info, John. Great answer.

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Larry Wall says

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2 years ago
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    Phyllis Doyle Burns (Phyllis Doyle) 2 years ago

    Very interesting. Thank you for participating, Larry.