From the Bilge
Waves
Category: General
Sea water is rarely still,it is usually moving in waves,tides or currents.Waves are caused by wind blowing across the surface of the ocean.
 The height of a wave is determined by the wind speed,the time the wind has been blowing,and the distance the wave has travelled over the ocean.
Water does not move along with with the waves. Instead the water changes shape as a wave passes,moving in a roughly circular motion,rising towards a wave crest as it arrives and falling as it passes.
This motion can be seen by watching a boat.The boat bobs up and down as the wave moves past it,but does not move along with the wave.
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