Answer:
The correct answer is Secondary Waves (S).
Explanation:
When the rocks inside the earth suddenly break, or an exploration occurs, seismic waves are generated.
When an earthquake occurs, the secondary waves (S) are the second to reach a seismometer. This type of waves is known as body waves and they travel through the interior of the Earth instead of moving over the surface.
The waves that arrive first are the Primary (P) waves that are the fastest type of seismic wave, therefore they are the first to reach a seismograph.
