What is characteristic of a granular soil structure?

A granular soil structure is characterized by small, rounded aggregates of soil particles known as peds. These peds are typically formed through the processes of soil development and are often associated with biological activity, which helps bind the particles together, often with the presence of organic matter. This structure enhances soil aeration, water retention, and root penetration, making it vital for plant growth.

The other options do not accurately describe granular soil structures. For instance, large boulders are not typical of granular soil but rather indicate a rocky or coarse soil type. The statement regarding deep subsoil suggests a different soil profile lacking the small, rounded peds indicative of granular structures. Lastly, while some granular soils can indeed be resistant to erosion due to their cohesive nature, this is not a defining feature of granular soil structures, which primarily focuses on the arrangement and composition of the soil particles themselves.