With points from the lecture, explain the formation of collapse sinkhole.

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With points from the lecture, explain the formation of collapse sinkhole.

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2013-02-25 Vanan 100.00 Check this speaking
2015-06-17 piyo 53.33 Check this speaking
2013-02-25 Vanan 95.00 Check this speaking
2013-02-27 Lauren 88.33 Check this speaking
2014-10-28 svt.ntu 85.00 Check this speaking
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