• Rhyolitic magma -- SiO 2 65-75%, low in Fe, Mg, Ca, high in K, Na Gases in Magmas At depth in the Earth nearly all magmas contain gas dissolved in the liquid, but the gas forms a separate vapor phase when pressure is decreased as magma rises toward the surface of the Earth. (coursehero.com)
  • and Yellowstone Caldera, Wyoming), suggesting a change in the respective magma systems in response to the passing seismic waves. (hawaii247.com)