Concept:Soil structure refers to the way soil particles are arranged into clumps or aggregates.
Explanation:Different soils have different structures based on their texture.
Sandy soil is usually single-grained because its particles do not stick together.
Clayey soil often forms blocky structures due to its fine, sticky particles.
Loam contains a balanced mixture of sand, silt, and clay.
This balanced mixture makes loam soft, porous, and easy to crumble.
Therefore, loam is best described as having a crumby structure.
Answer:C. crumby