a: Peristalsis ~
b: ocean waves
What:
Or maybe lake waves or wind waves. Anyhow, when water makes waves in a given direction the stuff floating in the water will move in the direction of the wave. The motion is up and down but in the vertical dimension but straight in the horizontal dimension.
Useful?
Writer:
LCC:
Where: Reference Link Has Evaporated
Date: Jul 10 2014 6:27 PM
# 5902 Critique Analogy