Question

which of these is an agent of chemical weathering? (1 point)
acid rain
iron
iron oxide
copper patina

Explanation:

Chemical weathering involves the breakdown of rocks or minerals through chemical reactions. Acid rain is a chemical weathering agent as it contains acidic components (like sulfuric and nitric acids) that react with minerals in rocks. Copper patina is a product of chemical weathering (copper reacting with elements in the environment), but it is not an agent. Iron is a metal, and iron oxide is a product of iron oxidation (rusting, which is a form of chemical weathering), but neither are agents of chemical weathering. Acid rain actively causes chemical changes in rocks/minerals.

Answer:

acid rain