Question

1. chemical weathering due to a metallic element reacting with oxygen

Explanation:

This describes oxidation, a type of chemical weathering where metallic elements react with oxygen in the environment to form oxides, which breaks down the original metal-bearing rock or mineral.

Answer:

This process is called oxidation (a specific form of chemical weathering; for example, iron reacting with oxygen to form iron oxide/ rust, which weathers iron-rich rocks).