Physical weathering is the process of breaking down rocks into smaller pieces through physical means such as:

- Frost wedging

- Ice wedging

- Thermal expansion and contraction

- Wetting and drying

- Biological activity

2. Chemical Weathering

Chemical weathering is the process of breaking down rocks through chemical reactions between minerals in the rocks and various chemicals in water, air, and organic matter. Some common chemical weathering processes include:

- Oxidation: Iron-bearing minerals react with oxygen to form iron oxides, which can weaken and disintegrate the rock.

- Hydrolysis: Water molecules break apart mineral structures by replacing certain ions with hydrogen ions.

- Carbonation: Carbon dioxide from the atmosphere dissolves in water and forms carbonic acid, which reacts with minerals like calcite and dolomite to form soluble compounds that can be carried away by water.

3. Biological Weathering

Biological weathering is the process of breaking down rocks through the actions of living organisms, including plants, animals, and microorganisms. Some examples of biological weathering include:

- Plant roots can pry open cracks in rocks and allow water to penetrate and cause further weathering.

- Animals can burrow into rocks and create channels for water to flow through.

- Microorganisms can produce acids that dissolve minerals in rocks.

4. Transport

Transport is the process by which weathered materials are moved from one place to another. This can be done by:

- Water (through runoff, streams, and rivers)

- Wind

- Ice (through glaciers and ice sheets)

- Gravity

- Animals