Soil horizons are distinct layers of soil, each with its own characteristics. These layers develop over time through the processes of weathering, erosion, and the activity of organisms. Here's a breakdown of the typical horizons:
* O horizon (Organic layer): This is the uppermost layer, consisting of decomposed plant and animal matter (humus). It's typically dark and rich in nutrients.
* A horizon (Topsoil): This is the layer of mineral soil mixed with organic matter. It's usually darker than the layers below and is where most plant roots grow.
* E horizon (Eluviated horizon): This layer is characterized by the loss of minerals and organic matter due to leaching. It's often lighter in color than the A horizon.
* B horizon (Subsoil): This layer is below the A horizon and often contains more clay, iron, and aluminum oxides than the layers above. It's often denser and harder than the topsoil.
* C horizon (Parent material): This layer is made up of the weathered bedrock or other geological material from which the soil formed. It's usually less weathered than the layers above.
* R horizon (Bedrock): This is the solid, unweathered rock beneath the soil.
Together, these soil horizons make up the soil profile. The specific horizons present and their characteristics vary depending on factors like climate, vegetation, and parent material.
Let me know if you'd like to know more about any specific horizon or the factors influencing soil formation!
