what is the lower mantle composed of
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what is the lower mantle composed of
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describe the composition of the mantle
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what is the lower mantle composed of, lower mantle composition, lower mantle composition earth, what is the mantle mostly composed of, what is the composition of the mantle, material of lower mantle, what is the lower mantle, describe the composition of the mantle, which layer contains the lower mantle, information about the lower mantle, elements in lower mantle, composition of mantle layer, composition of upper mantle
