'Magma P.I.' unearths clues to how crust was sculpted

About a decade ago, Johns Hopkins University geologist Bruce Marsh challenged the century-old concept that the Earth’s outer layer formed when crystal-free molten rock called magma oozed to the surface from giant subterranean chambers hidden beneath volcanoes.

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<p><a href="http://www.physorg.com/news115917564.html">'Magma P.I.' unearths clues to how crust was sculpted</a></p> <p>About a decade ago, Johns Hopkins University geologist Bruce Marsh challenged the century-old concept that the Earth’s outer layer formed when crystal-free molten rock called magma oozed to the surface from giant subterranean chambers hidden beneath volcanoes.</p>