If the magma cools and solidifies below the surface,it crystallizes as volcanic rocks.
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Q40: Some of Earth's most beautiful mountains are
Q41: No magmas contain dissolved gases.
Q42: If the magma reaches the surface,it forms
Q43: At oceanic spreading centers,magmas are rhyolitic in
Q44: Highly fluid basaltic lava may cool with
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
Q49: About 80 percent of the magma reaching
Q50: Over 80 percent of Earth's magma extruded
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