World War II created a pressing need to map the ocean floor. This actually led to research on the
ocean floor that would help explain the movement of the continents. What
tool was used to do this mapping?

Explanation:

it would be f

explanation:

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave