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The lower part of the mantle is called the mesosphere.
Mesosphere
The mesosphere
lower mantle. Or
The upper mantle is harder than the lower mantle
the asthenosphere
Working outwards from the centre: The Earth is believed to be formed of an inner core, outer core, inner mantle, outer mantle, and the crust. The mantle is two thousand miles thick and makes up more than three-quarters of the Earth's volume.
The middle mantle is just above the lower mantle.
The Lower Mantle
The lower mantle is beneath the crust.
The upper mantle and the lower mantle.
Temperature Density and Pressure