[Geology2] Texas: Giant unstable sinkholes are growing, could be on verge of catastrophic collapse

http://www.ibtimes.co.uk/texas-giant-unstable-sinkholes-are-growing-could-be-verge-catastrophic-collapse-1565636?utm_source=email&utm_medium=newsletter&utm_campaign=newsletter&spMailingID=478219&spUserID=MTI0NzI3MTQxMjgS1&spJobID=570106051&spReportId=NTcwMTA2MDUxS0

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