GENERAL GEOLOGY

Detailed explanation-1: -Sulfur dioxide and nitrogen gases create other types of acid rain that act as chemical weathering agents. Some sources of sulfur dioxide are power plants that burn coal; as well as volcanoes and coastal marshes. Sulfur gases react with oxygen and rainwater to form sulfuric acid.

Detailed explanation-2: -Acids are one substance that can cause chemical weathering. When rocks are exposed to acidic substances the acids react with minerals inside the rocks, weakening the structure of the rock and causing it to break down more quickly.

Detailed explanation-3: -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-4: -There are three different types of chemical weathering; carbonation, oxidation and hydrolysis.

Detailed explanation-5: -Hydrolysis-the breakdown of rock by acidic water to produce clay and soluble salts. Oxidation-the breakdown of rock by oxygen and water, often giving iron-rich rocks a rusty-coloured weathered surface.