AP Environmental Science Quiz
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EARTH SYSTEMS AND RESOURCES
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Which sequence correctly orders soil horizons from the surface downward in many temperate-region soils?
A
A, O, B, E, C, R, because organic matter is typically buried beneath mineral soil and illuviation occurs above eluviation.
B
O, A, E, B, C, R, because organic litter overlies topsoil, followed by leached material, subsoil accumulation, parent material, then bedrock.
C
O, E, A, B, R, C, because leaching creates the E horizon at the surface and bedrock forms above parent material.
D
R, C, B, E, A, O, because soils form upward from bedrock and therefore horizons are youngest at the top and oldest at the bottom.
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