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lower mantle

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
lower mantle [′lō·ər mant·əl]
(geology)
The portion of the mantle below a depth of about 600 miles (1000 kilometers). Also known as inner mantle; mesosphere; pallasite shell.


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As a team, Yin and James Rustad, a Chancellor's fellow and professor of geology, UC Davis, faced the challenge of determining how the competing effects of extreme pressure and temperature deep in Earth's interior would have affected the minerals in the lower mantle.
They were all formed by shield volcanoes fed by a constant flow of magma from a superheated pocket in the lower mantle called a hotspot.
The Inner Earth is composed of three main parts: The Crust - silicate rocks, primarily granite and basalt Oceanic Crust - mostly basalt Continental Crust - igneous, metamorphic, and sedimentary rocks The Mantle - iron and magnesium rich silicate rocks Upper Mantle Lower mantle The Core - iron nickel alloy Outer core Inner core The Crust The crust of the earth is very slowly growing thicker.
 
 
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