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Earthquake waves are of how many basic types?
ATen
BNine
CTwo
DSix
Answer & Solution
Correct answer: C. Two
1. Waves are grouped by where they travel.
2. Some pass through the body of the earth, others along the surface.
3. So there are two basic types.
4. The answer is two.
_Source: NCERT Class 11 Geography, Ch 3 'Interior of the Earth'_