In terms of stability, what distinguishes clay from other soil types?

Clay is distinguished from other soil types primarily by its ability to form very durable casts when molded. This property is due to the small particle size and the high plasticity and cohesion of clay particles. When water is present, clay particles swell and become pliable, allowing them to be shaped into stable forms that maintain their structure over time. This durability is essential for various applications, such as earthworks or pottery, where the longevity and structural integrity of the clay material are crucial.

In contrast, other soil types, like sand or silt, do not have the same level of cohesiveness, leading to weaker forms that can break apart more easily. Clay's unique characteristics contribute to its stability and performance in construction and agricultural practices, making it crucial to recognize in soil evaluation contexts.