The document discusses the processes of weathering and erosion. It defines weathering as the chemical and physical breakdown of rocks due to water, air, organisms and humans. There are two types of weathering: physical and chemical. Physical weathering breaks rocks into smaller pieces without changing their chemical composition, while chemical weathering alters the chemical makeup of rocks. The byproducts of weathering are sediment and soil. Erosion is then defined as the transport and deposition of these sediments elsewhere by forces like water, wind, and glaciers.