The waves were softly creeping to the shore. The waves were steadily approaching us. The enchanted sea was its own lord. The sand was being slowly soaked by the waves. All was still and quiet around us. A calm wave is an undisturbed body of water that appears flat and smooth. Such waves are caused by wind blowing over large bodies of water. They can be either surface waves or underwater waves. Calm waves are usually green or blue in color because of the algae that grows on top of them. Calm waves can be dangerous if you get caught up in one. In fact, they are your most likely chance of drowning. It is best not to go into the water if there is even a chance of thunderstorms because once in the water you will become helpless against powerful currents and winds. Also, beware of rip tides which can cause damage to boats and kill people. These are deadly waves brought about by strong storms that form when an area of low pressure causes waters to flow in opposite directions within a bay or channel. They can reach heights of more than 20 feet! Finally, don't swim in open waters during severe weather alerts because rescue crews are limited in what they can do if you get caught in a storm.