The recurrence interval ____
a. ?specifies the time that earthquakes of unknown magnitude will occur in a single area
b. ?predicts the time and magnitude of major earthquakes
c. ?predicts the average occurrence of major earthquakes in a single area
d. ?predicts the time and magnitude of minor earthquakes
e. ?specifies the average occurrence of major and minor earthquakes along a complete fault
ANSWER: c
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Pyroclastic igneous rock forms from ____
A)explosive volcanic activity B)rapidly cooling plutons C)viscous lava flows D)basalt and gabbro E)melting of country rock
Tsunamis in the open ocean can travel as fast as jet airplanes.
Answer the following statement true (T) or false (F)
Instead of the air flowing straight out of a high pressure system, it spirals out in a clockwise direction. The cause of the clockwise spiraling motion is:
A) pressure gradient force. B) centripetal force. C) inertia. D) Coriolis force. E) turbulence.
Rip currents _____
a. move parallel to the shoreline b. are fast moving swash c. are caused by the motion of the combined Earth-Moon system d. are due to the centrifugal force of rotation e. flow toward deep water from the nearshore zone