A pebble is thrown in a pond, and the water ripples on the surface. Of what type of wave is this an example?
A.a transverse wave because the vibrations move perpendicular to the wave's direction of travel
B.a transverse wave because the vibrations move parallel to the wave's direction of travel
C.a longitudinal wave because the vibrations move perpendicular to the wave's direction of travel
D.a longitudinal wave because the vibrations move parallel to the wave's direction of travel