The width of the outer core is 1,350 miles.
Earth's outer core is a fluid layer about 2,200 km thick, composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle.
The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel.
The width of the outer core is calculated as follows;
Δx = (3991 mi ) - (32 mi + 1821 mi + 788 mi)
Δx = 1,350 mi
Thus, from the data given, the width of the outer core is 1,350 miles.
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