Which kind of seismic wave is responsible for the most shaking (and thus, the most damage to human structures)?
A) P waves
B) S waves
C) surface waves
D) scarp waves
Answer: C
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According to most estimates, Earth is approximately
A. 4.6 million years old. B. 4.6 thousand years old. C. 4.6 billion years old. D. 4.6 trillion years old.
Clouds continually are pulled to the ground by gravity. Why do they stay aloft?
A. New cloud droplets continually replace those that fall to Earth's surface. B. Water evaporating from Earth's surface presents an opposing force to the falling cloud droplets. C. Updrafts of air oppose the gravitational force. D. Clouds weigh so little that they fall too slowly to be noticed.
At divergent plate boundaries, plates are moving ____________________. At these locations, new
____________________ forms. Fill in the blank(s) with the appropriate word(s).
Carbon dioxide in seawater keeps the water's pH ________.
A. strongly alkaline B. neutral C. strongly acid D. slightly alkaline E. slightly acid