what range of silica (si02) is found in magma
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Types of Magma
SiO2 is the most abundant oxide. Rhyolitic or Granitic -- SiO2 65-75%, low in Fe, Mg, Ca, high in K, Na.
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The silica content of the magma determines how thick the magma is, how easily it flows and how easily dissolved gases within the magma can escape; therefore the silica content determines the characteristic of the volcanic eruption and the shape and size of the resulting volcanic cone.
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