* Clay: The most common component, transported from the A horizon (topsoil) by water.
* Iron oxides: Give the B horizon its reddish-brown color in many cases.
* Humus: Decomposed organic matter, although less than in the A horizon.
* Carbonates: Calcium carbonate or other salts may accumulate, especially in drier climates.
* Silica: Accumulation of silica, leading to a hardpan layer.
* Other minerals: Depending on the parent material and local conditions.
The specific materials found in the B horizon vary depending on factors like:
* Climate: Arid climates tend to have higher carbonate accumulation, while humid climates may have more iron oxides.
* Parent material: The underlying rock type influences the mineral composition of the B horizon.
* Vegetation: The type of plants in the area can affect the amount of organic matter in the B horizon.
It's important to note that the B horizon is often denser and less porous than the A horizon due to the accumulation of material. This can limit root growth and water infiltration.
