P-waves and s-waves are also known as
a. surface waves.
b. ground waves.
c. transverse waves.
d. seismic waves.

d. seismic waves and c. transverse waves.

Explanation:

Hi, S waves are also known as transverse waves. The S stands for secondary wave because is the second arrival on an earthquake seismogram.  

P waves are also known as seismic waves in seismology. The P Stands for primary wave because is the wave that has the highest velocity.

Feel free to ask for more if needed or if you did not understand something.

b.

explanation:

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