While P and S waves radiate outward in ___ ___, ___ ___ travel along the surface of the earth. P wave are ___ wave that travel through ___.
S waves are ___ (transverse) waves that travel through ___ only.
P waves refract and slow down when they hit ___
Which wave is slower, P or S waves? ___
Which wave has a larger (broader) shadow zone area, P or S waves? ___
The differences in the shadow zones told scientist that the outer core is ___ phase
because ___ waves go through and ___ waves are not detected.