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Question
Earthquake is caused by
Options:
A .  breakage of rock system
B .  disturbance of earth surface
C .  upliftment of rocks
D .  adjustment of layers of earth’s crust
Answer: Option B
Answer: (b)
Most earthquakes are minor tremors. Larger earthquakes usually begin with slight tremors but rapidly take the form of one or more violent shocks, and end in vibrations of gradually diminishing force called aftershocks.
The subterranean point of origin of an earthquake is called its focus; the point on the surface directly above the focus is the epicentre.

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