Statement I: Chemical weathering processes are found more active in hot and humid environment. Statement II: High temperature and rainfall help in the process of decomposition of rocks.

Chemical weathering involves the gradual decomposition of rocks through chemical reactions such as oxidation, hydrolysis, and carbonation. These processes are most active in hot and humid environments because chemical reactions generally proceed more rapidly at higher temperatures [1]. Furthermore, water is a critical agent for these reactions, acting as a solvent and reactant; thus, abundant rainfall in tropical regions significantly accelerates rock decay. Statement I is true as warm, wet climates promote rapid chemical weathering while dry climates inhibit it [1]. Statement II is also true because high temperature and moisture are the primary environmental controls that facilitate the transformation and decomposition of minerals. Since the high temperature and rainfall mentioned in Statement II are the specific climatic factors that drive the activity described in Statement I, Statement II provides the correct explanation for Statement I.

Sources

1. [1] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 4: Weathering, Mass Movement and Groundwater > CHEMICAL WEATHERING > p. 37