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lower mantle

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Noun1.lower mantle - the deeper part of the mantle
layer - a relatively thin sheetlike expanse or region lying over or under another
mantle - the layer of the earth between the crust and the core


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The lower mantle, a thick region of Earth's inner structure, lies just outside the planet's core.
Under pressure: high-stress tests show surprising change in a mantle ... by Perkins, S. / Science News
Others contend that propagating cracks in the lithosphere create oceanic islands, that plumes do not exist, that the upper and lower mantle are isolated and depleted, and that MORB and OIB form from the same upper-mantle reservoir.
Igneous rock associations 5. oceanic island volcanism II: mantle ... by Mallory-Greenough, Leanne M. / Geoscience Canada
Deeper inside Earth, in the lower mantle or the core, temperatures are too high for diamonds to form.
Diamonds from outer space by Stiefel, Chana Freiman / Science World
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