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