Viscous magmas have __________ silica content than less viscous magmas and have __________ dissolved-gas content.
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Q12: _ occurs when the speed of a
Q13: _ waves are reflected and refracted as
Q14: The deepest and most powerful earthquakes occur
Q15: _ is a mixture of molten rock,
Q16: _ magma contains about 50% silicon dioxide
Q18: _ are steep conical mountains that consist
Q19: A common sign of an imminent volcanic
Q20: The ring of andesitic volcanoes surrounding the
Q21: Earthquakes occur when rock masses break and
Q22: Surface waves travel through Earth rather than
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