The oceans contain species yet to be discovered, cures for diseases, and keys to understanding the weather.
Ocean currents circulate heat, water, nutrients, and any garbage that falls into ocean water.
Thor Heyerdahl and his crew of four sailed their balsa raft, the Kon-Tiki , across 4,300 miles of the Pacific Ocean. Floating on ocean currents, they recreated the voyage of ancient mariners thought to have sailed from Peru to Indonesia. The pull of gravity between Earth, the moon, and the sun causes ocean tides. The size, shape, and depth of a water basin control a tide s height. 5. Bioluminescence, the light produced by living organisms, is seen in deep ocean depths.