Warm-Up: GeologyOnline version Test your knowledge by correctly ordering the layers of the Earth from the outermost to the innermost layer. by Noel Sayco 1 Order the layers of the Earth from the surface down to the core. Mantle Inner Core Outer Core Crust 2 Order the soil horizons from the topmost layer to the bottommost layer. C Horizon (Parent material) B Horizon (Subsoil) E Horizon (Eluviation layer) R Horizon (Bedrock) O Horizon (Organic layer) A Horizon (Topsoil) 3 Order the elements based on the natural sequence of processes in the rock cycle. (Start with MAGMA) Magma Igneous rock formation Heating and Pressure Melting Metamorphic rock formation Sedimentary rock formation Sediments formation Weathering and erosion