The magnitude of a very destructive earthquake is

a. 4-5
b. 7 or above
c. 6-7
d. below 3

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Solution

The correct answer is option (b).

Explanation: The magnitude of an earthquake is measured by a Richter scale. The numbers on the scale range between 1 to 9. Earthquakes of magnitude 7 or above are destructive and can cause extreme damage to life and property.

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How much more destructive energy does an earthquake of magnitude 7 has in comparison to an earthquake of magnitude 5?

On Richter scale, an increase in magnitude of 4 units mean that the destructive power of the earthquake increases by 4 times.

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