Ocean

Ocean, We may live on land, but we cannot survive without the ocean. The water covering most of our planet helps create the air we breathe. Millions of tiny plants that live in the ocean produce the precious gas in the air, which we call oxygen. The ocean also works to keep our climate comfortable. Its cold and warm currents travel the globe, heating and cooling entire countries. Huge amounts of water on its surface are constantly evaporating, then fall as rain or snow over other parts of the world. Acting like a giant heat reservoir, the ocean even collects the SunÍs excess rays, preventing the tropics from burning up! Deep beneath the oceanÍs surface is a hidden universe. This mysterious world has its own towering mountains, deep valleys, and even exploding volcanoes. It is also home to an amazing variety of animals. Rising up from the ocean floor, islands and continents divide the ocean into five different oceans as well as several dozen seas. (Photo by: QAI Publishing/Universal Images Group via Getty Images)