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    why is the upper mantle in molten state ?
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    (Original post by merciana)
    why is the upper mantle in molten state ?
    This is a good explanation imo. If you dont understand it then I will find another, but it seems straightforward. Its not molten, but it is malleable.

    http://wtamu.edu/~cbaird/sq/2013/07/...f-molten-rock/

    https://www.nationalgeographic.org/encyclopedia/mantle/
 
 
 
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