Which soil horizon is on the bottom?

The soil horizon on the bottom is known as the "C horizon." This layer consists of weathered rock and minerals and serves as the foundation for the soil above. It’s not as fertile as the upper layers, but it's crucial for plant growth as it provides essential nutrients as it slowly breaks down over time. Below the C horizon is the R horizon, or bedrock, which is composed of solid rock. The interaction of these horizons plays a key role in soil formation. The C horizon influences the properties of the overlying soil layers, showing how everything in the soil profile is interconnected—even down to the bedrock!