Discussion
Which of the following is an example of chemical weathering?
Answer: D
All the above are chemical weathering.
Oxidation turns iron minerals to rust and crumbles the rock; carbonation dissolves limestone as \[\mathrm{CaCO_3 + H_2O + CO_2 \rightarrow Ca(HCO_3)_2}\] which is how caves form; and acid rain accelerates both. Each alters the rock's chemical composition, unlike physical weathering by frost or heat.
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