Earth's outer core
Fluid layer composed of mostly iron and nickel between Earth's solid inner core and its mantle / From Wikipedia, the free encyclopedia
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For broader coverage of this topic, see Internal structure of Earth § Core.
Earth's outer core is a fluid layer about 2,260 km (1,400 mi) thick, composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle.[1][2][3] The outer core begins approximately 2,889 km (1,795 mi) beneath Earth's surface at the core-mantle boundary and ends 5,150 km (3,200 mi) beneath Earth's surface at the inner core boundary.[4]