Home › ICSE Class 9 › Geography › Structure of the Earth › Refraction of earthquake waves happens when they:
Refraction of earthquake waves happens when they:
ACross materials of different densities
BReach the open air far above
CMeet another earthquake's waves
DSlow down deep inside a mine
Answer & Solution
Correct answer: A. Cross materials of different densities
1. Wave direction and velocity change with the medium.
2. Crossing materials with different densities bends them.
3. That bending is refraction.
_Source: NCERT Class 11 Geography, Ch 3 'Interior of the Earth' (kegy203)_
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