Physical erosion is the process by which rocks and soil are broken down into smaller pieces without changing their chemical composition. This occurs through natural forces such as wind, water, ice, and temperature changes. For example, when water freezes in cracks of rocks, it expands and can cause the rocks to break apart over time. This type of erosion is a key factor in shaping landscapes, creating features like valleys and canyons. It also plays a significant role in soil formation and the movement of sediments. Understanding physical erosion helps in managing natural resources and protecting the environment from degradation.