Soil horizon: A distinct layer of soil (O, A, B, C horizons) with characteristic composition, texture, and color.
How to apply it: Use soil horizons to explain why the A horizon (topsoil) is most important for agriculture due to its organic content.
Course: AP Environmental Science · Unit: Earth Systems and Resources
Practice questions about Soil horizon on AimFive — get rubric-based feedback showing exactly which points you earned.
AP and Advanced Placement are trademarks of College Board. AimFive is not affiliated with or endorsed by College Board.