What are the two types of soil structure?

The two types of soil structure that are commonly recognized in soil science are granular and blocky. Granular structure is characterized by small, rounded aggregates that resemble granules. This type of structure is often found in the topsoil and is beneficial for plant growth because it allows for good water infiltration, aeration, and root penetration.

Blocky structure, on the other hand, consists of larger aggregates that form block-like shapes, often with flat faces. This structure is commonly found in subsoil horizons and is also beneficial as it provides good drainage and root development. Together, these structures play a crucial role in soil fertility and health, impacting aspects such as moisture retention, aeration, and the movement of nutrients.

The other options mention combinations that either don't represent recognized categories of soil structure or are less commonly used in soil classification contexts. Therefore, recognizing granular and blocky as the primary types provides a solid foundation for understanding soil behavior and characteristics.