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Really destructive earthquakes have magnitudes above:
A3
B5
C9
D7
Answer & Solution
Correct answer: D. 7
1. The Richter scale measures the power of a quake.
2. Bhuj and Kashmir both crossed a magnitude of 7.5.
3. Really destructive earthquakes are higher than 7.
4. So the answer is 7.
_Source: NCERT Class 8 Science, Ch 12 'Some Natural Phenomena'_
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