GENERAL GEOLOGY

Detailed explanation-1: -Chemical Weathering Chemical weathering changes the molecular structure of rocks and soil. For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock.

Detailed explanation-2: -The patina that forms on copper roofs is a result of weathering and changes in the chemical composition of the metal. It’s a process of oxidation that happens over time that turns copper green. Other metals can acquire a patina as well. Even old wood furniture can get a sheen of oxidation in time.

Detailed explanation-3: -Physical, or mechanical, weathering happens when rock is broken through the force of another substance on the rock such as ice, running water, wind, rapid heating/cooling, or plant growth. Chemical weathering occurs when reactions between rock and another substance dissolve the rock, causing parts of it to fall away.

Detailed explanation-4: -Biological weathering is caused by the movements of plants and animals. For example, a rabbit can burrow into a crack in a rock making it bigger and eventually splitting the rock, or a plant may grow in a crack in a rock and, as its roots grow, cause the crack to widen.