There are only a few places in the world where the tidal range is great enough to justify the cost of building dams to harness this energy. Though the need for alternate power sources is not great enough for countries to use tidal power, France is the only country that successfully uses this power source. French engineers have noted that if the use of tidal power on a global level was brought to high enough levels, the Earth would slow its rotation by 24 hours every 2,000 years. The highest tides in the world are found in the Bay of Fundy, Nova Scotia, Canada. At times during the year the difference between high and low tide may be as high as 53 feet, the equivalent of a three-story building.
Sea foam is made of air bubbles separated by a film of liquid.
Air bubbles in fresh water unite, while air bubbles in salt water bounce off of each other. When these air bubbles rise to the surface in the ocean, they burst and release salt spray into the air. It is believed that most of the airborne salt comes from the bursting of bubbles. The North and South Equatorial Currents join to flow through the passages between the Windward Islands into the Caribbean Sea. The resulting current flows through the Yucatan Channel and only has an outlet between Florida and Cuba.