Question

Aftershocks occur because ________.
A) seismic energy continues to build up for a period of time after a major earthquake
B) the day after a large earthquake there are tidal forces that continue to create additional earthquakes
C) the area surrounding a region that experienced a large earthquake needs time to adjust to the displacements on the main fault
D) there are always small earthquakes on major faults, but we do not notice them until there is a large event that makes us aware of them

Answer

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