GEOLOGY

Detailed explanation-1: -P waves, or Primary waves, are the first waves to arrive at a seismograph. P waves are the fastest seismic waves and can move through solid, liquid, or gas. They leave behind a trail of compressions and rarefactions on the medium they move through. P waves are also called pressure waves for this reason.

Detailed explanation-2: -Compressional waves are also called P-Waves, (P stands for “primary") because they are always the first to arrive. They gave us the first jolt last Friday. Shear waves propagate more slowly through the Earth than compressional waves and arrive second, hence their name S-or secondary waves.

Detailed explanation-3: -Answer and Explanation: The only statement that is true is that the p-waves or primary waves travel faster, and thus arrive sooner than do the s-waves or secondary waves which is choice B.

Detailed explanation-4: -P waves travel through the fluid layers of the Earth’s interior, and yet they are refracted slightly when they pass through the transition between the semisolid mantle and the liquid outer core.