how does the upper mantle differ from the lower ,mantle
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There are very small differences between the two layers. The upper mantle has Olivine (a very special rock), compounds with silicon dioxide, and a substance called Peridotite. The lower mantle is more solid than the upper mantle.
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Temperature is one of the differences between the two upper layers of the mantle. ... Pressure is one great difference between the upper and lower mantle. The viscosity of the upper mantle is greater than the viscosity of the lower mantle. This is because there is less pressure at the upper mantle.
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