Which of these statements best explains why p waves arrive earlier than s waves at the seismic station?

a. s waves are generated after p waves arrive at the surface
b. s waves make longer lines on the seismogram than p waves
c. p waves are created first and s waves originate from p waves when they are reflected by solid rocks
d. p waves move straight through all medium and s waves move only through solids in a curvy motion

D. P waves move straight through all medium and S waves move only through solids in a curvy motion

Explanation:

The first kind of wave that is mentioned here is the P wave. This is also called the primary wave. This type of wave can move through solid rock and fluids. Because of this, this is the wave that arrives first at a seismic station. These are compressional waves. On the other hand, S waves are the second type of wave that you feel in an earthquake. These are slower and do not move through liquid mediums.

the diagram which shows forces as either balanced = same speed or unbalanced = accelerarting

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нσρє ι ¢συℓ∂ нєℓρ.