The action that can help slow down the process of chemical weathering is removing iron oxide to avoid breaking down rocks. Chemical weathering often involves the reaction of minerals with water and other chemicals in the environment, and iron oxide can contribute to the breakdown of rocks. However, while reducing iron oxide might help slow down certain types of weathering, it is important to note that chemical weathering is a complex process influenced by many factors.
The other options, such as burning less fossil fuel or using less water in industrial areas, would have more to do with reducing pollution and resource consumption rather than directly affecting the rate of chemical weathering.