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A) The decomposition of primary minerals
Explanation:
The chemical weathering is the process in which the rocks and minerals are break down by the chemical reaction. Then, it lead to the decomposition of primary minerals into other minerals.
Weathering is the chemical and physical process that change the state of chemical process in the surface of earth. Chemical weathering dissolve by the chemical process which basically form the residual materials.
This process cause rust when the iron react with the oxygen in the rocks and then it form iron oxide.