Interesting facts about the oceans

Did you know that 95 percent of the surface of our planet is oceans and uninhabited lands, where even meteorological observations are not conducted?

There are 19 known deep-water depressions in the world's oceans, the depths of which exceed 7 kilometers, of which 15 are in the Pacific Ocean, 1 in the Indian Ocean and 3 in the Atlantic.

The deepest ocean in the world is 11, 034 meters. If we consider that the highest peak in the world - Mount Chomolungma (Everest) rises 8, 882 meters above sea level, then the distance between the highest and lowest points of the earth's crust is 20 thousand meters.

Countless treasures are found at the bottom of the ocean in the form of salt build-ups that settle from the sea water. These outgrowths, covering about 100 million square kilometers of ocean floor, contain 50 producers of magnesium, 15 percent iron, as well as copper, nickel and cobalt.

According to average estimates, the world's oceans contain tens of millions of tons of gold in a dissolved state, but the cost of chemical methods of its extraction is much higher than the cost of the extracted metal.

Deepening by 10 meters entails an increase in water pressure by one atmosphere. Thus, in oceanic trenches 10 thousand meters deep, the pressure reaches a thousand atmospheres.

Water is an active light absorber. At a depth of 10 centimeters, 80 percent of the light rays falling on the surface penetrate. Under a layer of water of 100 meters, only 2 thousandths of a percent of light spreads, and below - the kingdom of eternal darkness.

Hydroacoustics registered a "false bottom" in the ocean. It was found that it arises as a result of the accumulation of plankton - microscopic animals and plants - in the water column of the ocean. The "false bottom" partially reflects and strongly absorbs ultrasounds.

In the seas and oceans, coral reefs cover an area of ​​28 million square kilometers. Off the northeast coast of Australia, coral reefs form a 22, 000-kilometer-long barrier.