* Rainwater: Rainwater is slightly acidic due to dissolved carbon dioxide from the atmosphere. This acidity can react with certain minerals in rocks, causing them to break down. This is a major form of chemical weathering.

* Ocean water: Ocean water is also slightly acidic, but it also contains dissolved salts. These salts can react with rocks, leading to weathering. Additionally, the constant movement of waves and tides can physically break down rocks, creating more surface area for chemical weathering.

* Flowing water: Flowing water, whether in rivers, streams, or even groundwater, can carry dissolved chemicals that react with rocks. This process is especially important in areas with high rainfall or where water flows through acidic soils.

In summary, all of these agents contribute to chemical weathering in different ways.