Wentworth grain size scale

The Wentworth grain size scale is a way geologists classify particles in sediments—like sand, silt, and gravel—based on their diameter. It uses size ranges measured in millimeters to categorize particles into groups such as clay, silt, very fine sand, fine sand, medium sand, coarse sand, very coarse sand, gravel, cobbles, and boulders. This standardized scale helps scientists communicate about sediment sizes accurately, which is important for understanding soil and rock properties, sediment transport, and geological history.