Part of the Earth's mantle below the lithosphere and the asthenosphere, but above the outer core
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4 identifiers linking mesosphere across the web's reference databases
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The lower mantle, historically also called the mesosphere, occupies about 56% of the total volume of Earth, and is the region from 660 to 2,890 km below Earth's surface; between the transition zone and the outer core. The preliminary reference Earth model (PREM) separates the lower mantle into three sections, the uppermost, mid-lower mantle, and the D layer.