A(n) ____ is a very large column of superheated mantle that originates at the boundary of the core and
mantle.
a. Volcano
b. Plume
c. Asthenosphere
d. Ridge
ANS: B
A mantle plume is a large column of superheated mantle. The largest of these plumes are known as
superplumes. There is a superplume that lifts all of Africa. These are mediums for heat from the core
and are thought to resupply the asthenosphere. Information can be found in the section The
Confirmation of Plate Tectonics.
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