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]
- ^ "Earth's Interior". Science & Innovation. National Geographic. 18 January 2017. Archived from the original on May 6, 2017. Retrieved 14 November 2018.
- ^ Sue, Caryl (2015-08-17). Evers, Jeannie (ed.). "Core". National Geographic Society. Retrieved 2022-02-25.
- ^ Zhang, Youjun; Sekine, Toshimori; He, Hongliang; Yu, Yin; Liu, Fusheng; Zhang, Mingjian (2014-07-15). "Shock compression of Fe-Ni-Si system to 280 GPa: Implications for the composition of the Earth's outer core". Geophysical Research Letters. 41 (13): 4554–4559. Bibcode:2014GeoRL..41.4554Z. doi:10.1002/2014gl060670. ISSN 0094-8276. S2CID 128528504.
- ^ Young, C J; Lay, T (1987). "The Core-Mantle Boundary". Annual Review of Earth and Planetary Sciences. 15 (1): 25–46. Bibcode:1987AREPS..15...25Y. doi:10.1146/annurev.ea.15.050187.000325. ISSN 0084-6597.