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• 16:07, 1 May 2009 Robertsp talk contribs uploaded File:Prr-1.gif (Fig. 14. Mechanisms for cave enlargement. (1) Conversion of limestone to gypsum crust by sulphuric acid, dissolved by the cave stream and by infiltrating freshwater. (2) Drips of sulphuric acid from the gypsum wall crust and snottites corrode limestone be)