Figure 9.3

GEO-GRAPHIC: Soil and soil horizon development. (A) Through weathering and biological activity, surfaces of bare bedrock form soils over time. (B) Eluviation and leaching lead to the formation of soil horizons. (C) There are six main categories of soil horizons, arranged vertically. Few soils have all six categories, and some soils have none.

(A. Bruce Gervais)