Weathering occurs as rocks, minerals or similar materials break into smaller parts or disintegrate. Weathering has multiple causes including physical factors such as pressure and chemical factors. In the case of chemical factors, one of these factors is carbonation that occurs as a chemical reaction between water and carbon occurs, and later this reacts with rocks dissolving them.
This process begins when rain or water combines with carbon dioxide forming carbonic acid, later carbonic acid reacts with calcium carbonate of some rocks and minerals, which leads to partial or complete dissolution of the rock (weathering). This process is only possible if there is water because without this the carbonic acid would not form. Therefore, carbonation is the type of weathering that requires water.
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