A common sign of an imminent volcanic eruption includes swarms of small __________ of increasing frequency or intensity.
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Q14: The deepest and most powerful earthquakes occur
Q15: _ is a mixture of molten rock,
Q16: _ magma contains about 50% silicon dioxide
Q17: Viscous magmas have _ silica content than
Q18: _ are steep conical mountains that consist
Q20: The ring of andesitic volcanoes surrounding the
Q21: Earthquakes occur when rock masses break and
Q22: Surface waves travel through Earth rather than
Q23: The focus is the point on a
Q24: Large-magnitude earthquakes are quite frequent.
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