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9 September, 11:55

The layer of earth that has the lightest elements is the

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  1. 9 September, 15:01
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    If I remember correctly (from my studies long time ago) the layers are from the outer to the center:

    SiAl : Silicon-Aluminum

    SiMa : Silicon-Magnesium (although should be Mg)

    NiFe : Nickel-Iron

    The SiMa layer should have the lightest elements (Magnesium is lighter than Aluminum)
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