The World Ocean is the water cover of the planet occupying nearly 75% of the space of Earth. The set of the seas and four oceans - the biggest water spaces in the world is its part. Of course, depth of oceans is various depending on a geological structure of a bottom.
Instruction
1. To determine ocean depth, it is necessary to get acquainted with the structure of a seabed. Depending on a geological structure and situation four main types of a relief of an ocean floor are allocated. The continental shelf is in fact a flat underwater part of the continent, its depth varies ranging from 200 up to 500 meters. The total world area of shelves - about 32 million square kilometers. The shelf is followed by a continental slope - border between the shelf and the underwater region of the continent, its depth up to 3500 meters. An oceanic bed its depth within 6000 meters represents the main part of a seabed. The tectonic breaks in an ocean bed creating "ravines" with depth more than 6 kilometers are called deep-water trenches.
2. The Mariana Trench located in the Pacific Ocean is considered the deepest point of a seabed. Its depth is 11022 meters. At the same time the average depth of the Pacific Ocean - about 4300 meters. Besides the largest depth the Pacific Ocean is also the biggest of four - its area a little less sum of the areas of all other oceans.
3. On the maximum depth ranks second the Atlantic Ocean. The deep-water Puerto Rico Trench going from the island of the same name towards Central America was studied in 1955, and measurements showed that the distance to the bottom in the deepest place makes 8385 meters. Average depth of the Atlantic Ocean - 3600 meters.
4. On the third place on record depths - the Sunda deep-water Trench in the Indian Ocean. Stretching for 4000 kilometers on a bottom, opposite to the island of Bali it reaches depth of 7729 meters. As for average value of depth of the Indian Ocean, it is 3900 meters.
5. At last, the Arctic Ocean - the smallest both on the area, and by the number of the seas belonging to him. The maximum depth it in the Greenland Sea is 5.5 kilometers, and average - only 1200 meters. Such small figures are connected with the fact that nearly a half of the area of its bottom belongs to the shelf, that is has depth to 200 meters.