# What is dissolution and how does this result in weathering?

The carbon dioxide present in the atmosphere is dissolved in the rainwater which becomes acidic. Once this acidic water impacts calcareous rocks (limestone) the calcium carbonate, ${\text{CaCO}}_{3}$, which is their major component is transformed in calcium bicarbonate, "Ca"("HCO"_3)_2, soluble in water and thus removed from the rock. The resulting is the progressive erosion of the rock.This process is called weathering.