Earthquakes occur when rock masses break and slip past one another along a fault.
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Q16: _ magma contains about 50% silicon dioxide
Q17: Viscous magmas have _ silica content than
Q18: _ are steep conical mountains that consist
Q19: A common sign of an imminent volcanic
Q20: The ring of andesitic volcanoes surrounding the
Q22: Surface waves travel through Earth rather than
Q23: The focus is the point on a
Q24: Large-magnitude earthquakes are quite frequent.
Q25: Most seismic activity takes place along passive
Q26: Along the Ring of Fire, volcanoes can
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