Discussion
Carbonation weathering attacks limestone because rainwater dissolving carbon dioxide becomes
Answer: A
Correct answer: a weak carbonic acid
Rainwater dissolves carbon dioxide from the atmosphere and from the soil, forming carbonic acid, and that weak acid dissolves calcium carbonate to soluble calcium bicarbonate which is carried away. It is a slow reaction but a relentless one, and over geological time it produces the whole karst landscape - the enlarged joints, sinkholes and caverns that make limestone so troublesome an engineering material.
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