The characteristics of two layers of earth’s crust are listed. layer a: made of iron and nickel and responsible for earth’s magnetic field layer b: made mostly of solid iron which statement is true? layer a is the crust and layer b is the mantle. layer a is the mantle and layer b is the crust. layer a is the outer core and layer b is the inner core. layer a is the inner core and layer b is the outer core.
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