Catastrophic Collapse! Students use water-filled balloon to simulate Caldera collapse #GEESonTour #learningbydoing http://pic.twitter.com/2Qy5I1AOBz
— Stuart McLelland (@StuartMcLelland) March 8, 2016
via Twitter https://twitter.com/StuartMcLelland
March 08, 2016 at 07:59PM
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