Perpendicular. Light wave moves forward, the crests move at right angles to the wave
They're exactly the same thing, except that they're longer.
They're both electromagnetic radiation, differing only in wavelength (frequency),so their speed is the same.
transverse
a P wave is a primary wave. It is a compression wave, which means the particles of its medium (in this case, the ground) move in the same direction as the energy that is being transferred. (P waves...