Chemical weathering

Nat Sci: Physical Science

1. Chemical Weathering Chemical weathering occurs when chemical processes cause rocks to dissolve or decompose. also known as decomposition or decay. It is a way where rocks are broken down and chemically altered.

2. 3 Processess of Chemical Weathering: Oxidation Hydrolysis Carbonation

3. Oxygen reacts with iron to form iron-oxide, commonly called rust. Rust is easily breakable. Oxidation commonly occurs in materials that contain iron-bearing minerals . It causes the red hues in rocks. Oxidation

4. Olivine and Limonite are examples of rocks that contain Iron (Fe), which are susceptible to Oxidation .

5. Hydrolysis chemical breakdown of a substance when combined with water. Water changes the chemical composition and size of minerals in rock, making them less resistant to weathering.

6. Carbonation is the mixing of water with carbon dioxide to make carbonic acid. This type of weathering is important in the formation of caves. Dissolved carbon dioxide in rainwater or in moist air forms carbonic acid, and this acid reacts with minerals in rocks. CARBONATION

7. CAVES SINK HOLES