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How deep beneath the Earth's surface is the source of Magma?

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“Source” here would suggest the initial movement of hot rock that ultimately reaches the surface. Essentially everything sufficiently deep to be molten is magma. read more

The team of researchers, led by geophysicist Steve Jacobsen and seismologist Brandon Schmandt, has found pockets of magma about 400 miles beneath Earth's surface — clear signs of the presence of water, though not in its familiar liquid form. read more

"The results show that in some parts of the Earth, melting, or magma formation, happens very deep beneath Earth's surface," said geologist Jennifer Wade, a program director in NSF's Division of Earth Sciences, which funded the research. read more

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