On the water simulation, the crest (peak) of the wave look likes a plateau, a flat line and then going down. A vivid example is when a motorboat passes by, you
that represent a particle in water will tend to move up and down in the place
you are located. The motorboat creates ripples or vibrations within the water,
and when you move up and down, you are creating crests of waves shown as
vibrations in water.
