![]() The Pacific Ocean is the largest ocean, containing more than twice the volume of water as the Atlantic Ocean.The valley glaciers of Greenland produce some 12,000 to 15,000 sizable icebergs every year.Each year, three times as much rubbish is dumped into the world’s oceans as the weight of fish caught.Ocean water and ice make up almost 98 percent of all the water on Earth.The speed of sound in water is 1,435 m/sec – nearly five times faster than the speed of sound in air.The 2nd deepest known point in the ocean is the Tonga Trench in the western part of the Pacific Ocean reach depths in excess of 10,000 metres (32,800 feet).The deepest known point in the ocean is the Mariana Trench which reaches depths of over 36,000 feet (11,000 meters).If the ocean’s total salt content were dried, it would cover the continents to a depth of 5 feet.If all the land in the world was flattened out, the Earth would be a smooth sphere completely covered by a continuous layer of seawater 2,686 metres deep.At the deepest point in the ocean the pressure is more than 8 tons per square inch, or equivalent to one person trying to support 50 jumbo jets.(There may well have been other species that were never identified.) These include 79 invertebrates, 40 fishes, and 4 amphibians. At least 123 freshwater species became extinct during the 20th century.Earth is the only planet in our solar system to have oceans. ![]() Less than 1 per cent is fresh water, and 2-3 per cent is contained in glaciers and ice caps.
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