Discussion
Limestone is classed as a chemical or organic sedimentary rock because it forms by
Answer: D
Correct answer: precipitation or the accumulation of shells
Limestone is calcium carbonate, formed either by direct chemical precipitation from sea water or, far more commonly, by the accumulation of the shells and skeletons of marine organisms. Either way, no transported rock fragments are involved, which is what places it outside the clastic group - and its solubility in slightly acid groundwater, the source of all its engineering difficulties, follows from that chemistry.
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