Which type of soil forms a weak cast that crumbles when touched?

Loamy sand is composed of larger particles compared to other soil types, resulting in a structure that provides good drainage and allows for air circulation. This composition leads to a loose texture that easily crumbles when touched. Because it contains a relatively balanced mix of sand, silt, and clay, loamy sand has the ability to retain some moisture while still allowing excess water to drain effectively.

The characteristics of loamy sand make it less cohesive and more prone to crumbling compared to other soil types like clay, which tends to be sticky and form stronger clumps due to its fine particles. Sandy clay and silty loam also possess properties that lead to different textures and structural integrity, but they do not crumble as easily when handled. Thus, the specific combination of particle size and texture found in loamy sand is what allows it to form a weak cast that crumbles easily.