About 80 percent of the magma reaching the Earth's surface is basaltic,with only about 10 percent andesitic and 10 percent rhyolitic.
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Q44: Highly fluid basaltic lava may cool with
Q45: If the magma cools and solidifies below
Q46: The higher the viscosity of a magma,the
Q47: The lowest temperatures and highest SiO2 contents
Q48: Magma compositions are independent of the amount
Q50: Over 80 percent of Earth's magma extruded
Q51: Basaltic magmas have low contents of SiO2,low
Q52: The highest temperatures and highest SiO2 contents
Q53: Magma rising in a subduction zone tends
Q54: Over 90 percent of volcanism is associated
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