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