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  1. The average density of the outer-most layer (zone)- that is crust- of the earth is:

    2. A.

     1.2 to 5.0
    B.

     2.4 to 5.0
    C.

     2.1 to 3.0
    D.

     2.8 to 3.0

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    Answer : Option D

    Explanation :

    The average density of the upper crust is 2.8 and that of the lower crust is 3.0. This difference in density is believed to be due to the pressure.

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