Which term refers to the type of soil that is characterized by small, rounded aggregates?

The term that describes soil characterized by small, rounded aggregates is "peds." Peds are naturally occurring soil aggregates that form as soil particles bind together through various processes, including the activity of roots and soil organisms, as well as clay mineral interactions. The rounded shape of peds facilitates good soil aeration and water movement, which are vital for plant health and soil biology.

Peds can vary in size and can be made up of finer soil particles, often seen in well-structured soils. Their formation is critical in creating a well-aerated soil structure, contributing to soil fertility and enabling better root penetration for plants. This structure enhances the soil's capacity to retain moisture and nutrients effectively.

In contrast, clods are larger and rougher aggregates often formed through mechanical manipulation, while granules are typically smaller and have a more granular appearance. Blocks refer to more angular aggregates, which can indicate a different soil structure type.