An example of chemical weathering is an acid dissolving limestone. This is because an acid is a product of industrial and chemical processes that is used in a lot of commercial practices. It can dissolve limestone because the main component of limestone is calcium carbonate. Reacting this with an acid produces a carbon dioxide gas. Water breaking rocks is an example of physical weathering. Plant roots splitting rocks is an example of biological weathering. Wind breaking own rock is an example of physical weathering.