What is the term for small and fine parts of rocks often found in river sediments?

The term for small and fine parts of rocks often found in river sediments is silt. Silt consists of tiny particles that are smaller than sand but larger than clay. It is typically smooth to the touch and is known for its ability to retain moisture, which makes it significant in the context of river systems and sedimentation.

Silt is important in river environments as it can be transported by water and deposited in riverbanks, deltas, and floodplains. Its fine texture allows it to be carried over long distances by flowing water, contributing to the nutrient content of soil in these floodbed regions, which is vital for agriculture.

Understanding sediment types is critical in geography, especially concerning river dynamics, erosion, and deposition processes. Forming a integral part of alluvial deposits, silt plays a key role in shaping landscapes and contributes significantly to ecosystems within river environments.