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. Crust Mantle Outer Core Inner Core 2 Order the soil horizons from the topmost layer to the bottommost layer. E Horizon (Eluviation layer) A Horizon (Topsoil) B Horizon (Subsoil) C Horizon (Parent material) R Horizon (Bedrock) O Horizon (Organic layer) 3 Order the elements based on the natural sequence of processes in the rock cycle. (Start with MAGMA) Heating and Pressure Sediments formation Metamorphic rock formation Magma Weathering and erosion Sedimentary rock formation Igneous rock formation Melting