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Unformatted text preview: ESS 102 – Dangerous Planet Reading Quiz 4 1. Contrast the differences between basaltic and rhyolitic magma in terms of SiO2 percentage and percentage water content. Basaltic magma (~50% SiO2) is hotter (~1100-1200 degrees C) and more fluid than rhyolitic magma (~800-900 degrees C). Compared to basalt, the higher viscosity of rhyolite corresponds with lower rates of diffusion of water vapor hence its retention or build up as these magmas cool and begins to solidify; as a result, rhyolitic magmas tend to erupt explosively as they approach the surface and decompres...
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  • Fall '11
  • Na
  • 50%, Volcano, Basalt, eruption

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