Dissolution:
Dissolution is most thought of type of chemical weathering, and is most commonly known, when people hear CHEMICAL WEATHERING. That means it is a common type of chemical weathering. You know how sugar will dissolute into tea and coffee, and how salt will dissolute into water. Well dissolution is the tearing apart of mineral grains, but by other chemicals. Water is the most common. The water (or other chemical) flows against the rock, slowly tearing it apart, and causing shallow holes to form. The holes continue to grow, wider and deeper, when the water keeps rubbing against it, and the whole gets bigger and bigger. These wholes eventually form small caves. The caves grow bigger and bigger. Before you know it you have a giant cave, that was caused by DISSOLUTION. The cave takes millions of years to form though, because dissolution is not fast. It still can make a big change in the inner surface of the ground.