yasonfleek yasonfleek

13-02-2015
Mathematics

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what is a large underground opening formed by weathering and erosion

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chandislilly chandislilly

13-02-2015

Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by ground water circulating through them. As the rock dissolves, spaces and caverns develop underground.

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