GEOLOGY

Detailed explanation-1: -Rust formation is a prime example of chemical weathering due to oxygen.

Detailed explanation-2: -Another type of chemical weathering works on rocks that contain iron. These rocks turn to rust in a process called oxidation. Rust is a compound created by the interaction of oxygen and iron in the presence of water. As rust expands, it weakens rock and helps break it apart.

Detailed explanation-3: -Oxidation is another kind of chemical weathering that occurs when oxygen combines with another substance and creates compounds called oxides. Rust, for example, is iron oxide.

Detailed explanation-4: -Growth of plants on the rock. Temperature and pressure changes in nature. Freezing and thawing of water in cracks of the rock. Formation of salt crystals within the rock. Burrowing by animals.