Word: foamier
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...eventually makes its way toward the surface through channels in the overlying rock. As the ascending ooze climbs higher, the pressure on it is dramatically reduced, allowing gases trapped within to bubble out like carbonation in an opened bottle of soda. As this happens, the magma takes on a foamier consistency, increasing its speed and mobility. When this scalding froth rises high enough to make contact with subterranean water, the water flashes into steam, turning the whole hellish mix into a natural pressure cooker. Finally, the explosively pressurized magma blasts out of the earth in an eruption that can send...
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