Soil composed of medium-sized grains typically refers to sand. Sand tends to have particles that range in size from 0.05 to 2 millimeters in diameter. In the context of soil composition, the presence of medium-sized grains can also suggest a loamy soil, which is a mixture of sand, silt, and clay. Loamy soil has good drainage properties, retains moisture, and is often considered ideal for gardening and agriculture because it balances the characteristics of its components.
If you are specifically asking about soils within a classification system, USDA classification may categorize sandy soils as sandy loam or straight sand, depending on the proportion of silt and clay present alongside the sand.
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