The waves that help scientists to understand the internal structure of the Earth are

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Q: 51 (CDS-II/2012)
The waves that help scientists to understand the internal structure of the Earth are

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,17,46,27,17,8,11

keywords: 

{'primary waves': [0, 0, 0, 2], 'secondary waves': [0, 0, 0, 1], 'waves': [0, 0, 3, 0], 'surface waves': [0, 0, 0, 1], 'longitudinal waves': [0, 0, 0, 1], 'internal structure': [0, 0, 1, 2], 'earth': [0, 1, 1, 1], 'scientists': [2, 2, 8, 11]}

the correct answer would be either option 1 (primary waves) or option 2 (secondary waves), as these are the two types of seismic waves that travel through the Earth's interior and can be used to study its structure.