What are two examples for chemical weathering?

CARBONATION process by which dissolved carbon dioxide in rainwater or moisture in surrounding air forms carbonic acid and reacts with the minerals in the rock. This process weakens the rock thus breaking it down in the process.

e.g.: Calcium Carbonate + Water + Carbon Dioxide --->Calcium Carbonate (soluble)

HYDROLYSIS

chemical reaction between the minerals in the rock and hydrogen in rain water. For example, during hydrolysis, the feldspar in granite changes to claymineral which crumbles easily, weakening the rock and causing it to break down.OXIDATION The process by which oxygen combine with water and minerals in the rock such as calcium and magnesium. When iron reacts with oxygen, reddish -brown iron oxide is formed. The iron-oxide crust crumbles easily and weakens the rock.

e.g. : Iron + Oxygen --> Iron Oxide (crumbles)SOLUTIONprocess by which minerals in the rocks dissolve directly in water.

HYDRATION process where minerals in the rock absorb water and expand, creating stress which causes the disintegration of rocks.