Superjeep

[Mark Odegard]

>MANTLE PLUME--OED?  Used when we visited the glacier today.

I don't know if OED has it, but it should, perhaps under plume. Even I have
heard of this. The term, however, has nothing to do with glaciers and
everything to do with plate tectonics etc. A cursory web search turns up
some respectable-looking sites dealing with volcanism etc.
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