While there are many hundreds of different minerals,the overwhelming majority of the Earth's crust is composed of just eight common rock-forming minerals.
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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
Q55: Basaltic magma has the lowest viscosity,so more
Q57: The primary reason magma forms at subduction
Q58: Airborne pyroclasts have their finest grains settle
Q59: If lava reaches the sea or a
Q60: Beneath continents,rising basaltic magmas are contaminated by
Q61: The most abundant dissolved gas in magmas
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