Studying seismic waves generated by earthquakes provides seismologists with the information about the nature and composition of the earths interior .how do seismologists infer that the outer core is liquid in form?
A. Highly sophisticated equipment were used by the seismologist to study the Earth's interior
B. The velocity of the s-waves reaching the Earth's interior has gone to zero
C. Both P and S waves travel through the Earth's interior at varying speed
D. The velocity of the s-waves travelling the Earth's interior decreases
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