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21. How is primary wave related to secondary waves
A. They are both travelling through the crust of the earth.
B. They are both body waves that travel through earth's interior.
C. They are both surface waves that can move in the surface of the earth.
D. They are both having lesser frequency than Love and Rayleigh wave.​

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Answer:

B. They are both body waves that travel through earth's interior

Explanation:

(P-waves and S-waves), which travel through the interior of the earth, Primary waves, also known as P waves,Secondary waves, or S waves

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