Undulation shows life under the ocean, annotated with the statement “In the time it takes you to read this, a gentle sea wave has crested twice,” the type set in a wave form to denote the fact itself. Tides caused by the gravitational pull of the moon and the sun are one of the most reliable phenomena in the world. When wind speeds are low, the rise and fall of sea waves become faster. So a gentle sea wave will happen more frequently than a stormy one. (Source: Coastal Engineering, 2009 & Brysbaert, M. (2019, April 12)