<P> The outer core of the Earth is a fluid layer about 2,400 km ( 1,500 mi ) thick and composed of mostly iron and nickel that lies above Earth 's solid inner core and below its mantle . Its outer boundary lies 2,890 km ( 1,800 mi ) beneath Earth 's surface . The transition between the inner core and outer core is located approximately 5,150 km ( 3,200 mi ) beneath the Earth 's surface . Unlike the inner core , the outer core is liquid . The inner core is also referred to as the solid core . </P>
<P> The outer core of the Earth is a fluid layer about 2,400 km ( 1,500 mi ) thick and composed of mostly iron and nickel that lies above Earth 's solid inner core and below its mantle . Its outer boundary lies 2,890 km ( 1,800 mi ) beneath Earth 's surface . The transition between the inner core and outer core is located approximately 5,150 km ( 3,200 mi ) beneath the Earth 's surface . Unlike the inner core , the outer core is liquid . The inner core is also referred to as the solid core . </P>
what is the term for the thick layer surrounding earth 's outer core
what is the term for the thick layer surrounding earth 's outer core
mantle
mantle