Our transcription: Volcanic activity potentially threatens millions of people worldwide, but equally threatening is another common geologic phenomenon, "earthquakes."
Geologists have a general understanding of how earthquakes occur and the areas most prone to earthquakes have also been identified, but much remains to be learned about these events.
While scientists have successfully identified some signs of impending earthquakes, these precursors give little clue as to exactly when an earthquake will strike or how large it will be.
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