Discussion
Assertion (A): A deep focus earthquake is usually less damaging than a shallow one of the same magnitude.
Reason (R): Seismic waves attenuate as they travel through rock.
Select the correct option.
Answer: C
The greater travel path from a deep focus lets the waves spread and lose amplitude before reaching the surface, so attenuation is precisely why the shaking is weaker. Both statements are true and the second explains the first.
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