THE SCI­ENCE BE­HIND SINK­HOLES

World of Knowledge (Australia) - - Technology -

When un­der­ground mine shafts col­lapse, the soil that lies above them also moves. It’s a sim­ple prin­ci­ple with cat­a­strophic con­se­quences. Ev­ery me­tre of tun­nel that caves in means craters and cracks ap­pear on the sur­face.

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