1. Oxidation:

* Process: This involves the reaction of oxygen with minerals, often involving iron. Iron in rocks reacts with oxygen to form iron oxide, which is a weaker and more porous mineral. This process is commonly seen in the rusting of metal objects, and a similar effect happens with iron-containing minerals in rocks.

* Example: The red, brown, and orange colors you often see in rocks and soils are often due to the presence of iron oxides formed through oxidation.

2. Dissolution:

* Process: This involves the dissolving of minerals by acidic solutions. Rainwater itself is slightly acidic due to dissolved carbon dioxide, forming carbonic acid. Other sources of acidity include acid rain (caused by pollutants) or the presence of organic acids from decaying vegetation.

* Example: Limestone, composed primarily of calcium carbonate, is easily dissolved by acidic water. This process creates caves, sinkholes, and other karst landscapes.

Let me know if you'd like to learn about other types of chemical weathering!