Naturally-occurring acids in rain and sea water help in the process of weathering by which rocks are eroded. For the first time I recently noticed the patterned and textured edges of shallow depressions with just a centimetre or so of water on the horizontal surfaces of the Carboniferous Limestone at Spaniard Rocks on Rhossili Bay. These little pools seem to be showing evidence of the acid erosion process. You can almost literally see the rock dissolving around edges of the small pools.
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