48. Geologists are working hard to better understand why volcanoes erupt, so they can warn people
in advance. (A) Earthquakes often precede an eruption. (B) In addition, many eruptions are
accompanied by heavy rains. (C) However, because the quakes may come months before the
blast, or only hours before, they cannot be used for precise forecasts. (D) This is why it is hard
for researchers to predict when a volcano like Mt. St. Lorenzo will erupt again in the future.
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