This document discusses several natural weathering processes that break down rock over time including freezing and thawing which causes root wedging and exfoliation, abrasion through wind or water erosion, and chemical weathering from oxygen, acids, and carbon dioxide that react with rock materials.

1. Freezing and Thawing

2. Plants and Root wedging

3. Exfoliation

4. Abrasion

5. Oxygen

6. Acids

7. Carbon Dioxide