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What the earth layers are: RED â inner core ORANGE â outer core YELLOW â mantle BLACK â crust BLUE AND GREEN â land and water.
Freebase(3.75 / 4 votes)Rate this definition: Outer core. The outer core of the Earth is a liquid layer about 2,266 km thick composed of iron and nickel which lies above the Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km beneath the Earth's surface.