Chapter 9 September 21, 2019 admin A-Horizon A layer of soil also called topsoil, lots of soil organisms and organic material. Agriculture practice raising crops or livestock for human consumption. Alfisols soils that are typical of temperate deciduous forests. Ardisols soils that are typical of deserts, high in nutrient, little organic material B-horizon layer of soil that is also called subsoil, beneath the topsoil Related posts: LCC- Soils MT LCC- Soils Final Soils!!!!!!!! Chapter (Thompson, 1991). Chapter 2. Convergent plate boundaries