Volcanic Eruptions and the Earth's Core
Please explain how volcanic eruptions work in relation to
the earths outer core. I do no understand how the earth
could continuously have volcainic eruptions
(i.e. forming volcanic islands,
etc) and not "run out" of materials (i.e. magma, etc). Surely the earths
core does not have a "neverending" supply of volcanic material, so how
can the earth continue to release material from the core? Is there a way
that the earth "reclaims" or "pulls materials back in" to its core?
Yes. In many places, pieces of the earth's crust are diving down to the
mantle. This is happening off the coast of the Pacific Northwest, for
Richard E. Barrans Jr., Ph.D.
PG Research Foundation, Darien, Illinois
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Update: June 2012