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