Discussion
An earthquake is rated as 'major' if its magnitude in Richter Scale is in the range of
Answer: B
An earthquake is rated major if its magnitude on the Richter scale is between 7.0 and 7.9, option B. The usual descriptive classes are light at 4.0 to 4.9, moderate at 5.0 to 5.9, strong at 6.0 to 6.9, major at 7.0 to 7.9 and great at 8.0 and above.
The range in option A, 4.0 to 4.9, is the light class. The range in option D, 5.0 to 5.9, is the moderate class, and the range in option C, 6.0 to 6.9, is the strong class. Each of the wrong options is a lower class.
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