EntityQ857867· pop 36· linked from 104 articlesouter coreSign in to savefluid layer composed of mostly iron and nickel between Earth's solid inner core and its mantleConnectionslower mantleEntityseismologyEntityinternal structure of EarthEntityinner coreEntitycore–mantle boundaryEntitywaterEntitySolar SystemEntityironEntityhydrogenEntityoxygenEntitycarbonEntitychemical elementEntitysulfurEntityclimateEntitymagnesiumEntitysiliconEntitylightningEntitytemperatureEntityInternational Standard Book NumberEntitynickelEntityCategoriesGeomagnetismStructure of the Earth