Igneous intrusions form when molten rock, or magma, from deep underground ... you never know what you’ll find. ISLA: Yes, because it’s a volcanic plug. A plug forms when molten lava and ...
The Journal of Geology, Vol. 23, No. 8, Supplement: The Later Stages of the Evolution of the Igneous Rocks (Nov. - Dec., 1915), pp. 1-91 (91 pages) ...
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