What are known as seismic focus and epicentre with respect to an earthquake?
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The point of origin of seismic waves is called seismic focus. The point on the earth's surface directly above the seismic focus is called epicentre.
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State two natural causes of an earthquake.
Name two man-made causes of an earthquake. Give one example.
What is known as Richter scale? State its uses.
How are earthquakes useful?