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  1. The Earth's core is made up of very heavy material mostly constituted by:

    2. A.

     Iron and Aluminum
    B.

     Aluminum and Nickel
    C.

     Nickel and Iron
    D.

     Nickel and Lead

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    Answer : Option C

    Explanation :

    The solid, inner core of iron has a radius of about 760 miles (about 1,220 km), according to NASA. It is surrounded by a liquid, outer core composed of a nickel-iron alloy.

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