Why do cliffs collapse How do whole streets disappear into the ground How slowly do glaciers move What are the Moeraki Boulders and where did they come from Erosion and Sinkhole reveals the fascinating facts and the answers to these and many other questions. Why do cliffs collapse How do whole streets disappear into the ground How slowly do glaciers move What are the Moeraki Boulders and where did they come from Erosion and Sinkhole reveals the fascinating facts and the answers to these and many other questions.
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