Foreshocks May Be Caused by

Multiple Choice

Foreshocks may be caused by

A) the breaking of some asperities before the main movement occurs.
B) small movements that occur when some rocks break in limited areas of a fault plane prior to the main movement.
C) a limited number of lapilli breaking prior to the main movement.
D) the breaking of asperities and small movements prior to the main movement only.
E) all of these