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Answer:
P and S waves are types of seismic waves .P-waves is primary because they are fastest and S-waves are secondary because they are slower.
P waves travel through solids, liquids and gases while S waves travel only through solids.
The reason whey P waves are received but S-waves are not received by seismic stations located on the opposite side of Earth from an earthquake epicenter is because those waves(S-waves) cannot travel through the liquid core of the earth.
The reason why P-waves are received, but S-waves are not received by seismic stations is because P-waves can travel through the Earth and can reach every seismograph station.
It should be noted that and S waves are types of seismic waves. P-waves are received, but S-waves are not received by seismic stations due to the fact that S-waves can't travel through the liquid core of the Earth.
P-waves can travel through the Earth and can reach every seismograph station, unlike S-waves that can't go through the liquid outer core. It only creates a shadow.
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