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And another outcrop in the valley below, Craig Rhos-y-felin, supplied most of the rhyolite.—
John Timmer,
Ars Technica,
14 Aug. 2024 There was likely an intrusion of new magma under the volcano a few years before the 2011 eruption, so that event may have primed the rhyolite to erupt and caused the faults to become less stable as the stresses changed.—
Erik Klemetti,
Discover Magazine,
10 Mar. 2022
Word History
Etymology
German Rhyolith, from Greek rhyax stream, stream of lava (from rhein) + German -lith -lite