The Earth is known as the Blue Planet because nearly three-quarters of its surface is covered with water.
Deepest point : Challenger Deep, in the Marina Trench,10,924 metres down in the Pacific Ocean.
Temperature of most ocean water : 4°C, just above freezing.
Tallest mountain submerged in water : Mauna Kea in Hawaii over 10,000 m(from oceanic base).
Longest mountain range submerged in water : Mid-Ocean Ridge stretching 74,000 kilometres.
Biggest oceanic threat for humans : Rip currents (twisting of sea as waves break differently on different parts of the shore)★ Dissolved in every cubic kilometre of seawater is about 6 Kg of Gold. The ocean contains more than 1 billion cubic kilometres of water, which means there are 6 million tonnes of gold in the Earth's oceans !
★ The oceans are a hotbed of volcanic activity. In fact, 90 per-cent of all volcanoes are under the sea. The world's biggest concentration of active volcanoes is in the South Pacific, where there are over 1100 active volcanoes.
★ The world's tallest mountain is actually in the sea. It's the volcanic island Mauna Kea in Hawaii, and is 10,200 metres tall from the ocean floor to the summit. The reason why people call "Mount Everest" the tallest is that Mauna Kea is much under water; standing 4,205 m (13,796 ft) above sea level but when measured from its oceanic base, Mauna Kea is over 10,000 m (33,000 ft) tall—significantly taller than Mount Everest(8,848 m).
★ If the Ocean's total salt dried, it would cover all land on the Earth to a depth of 2 metres.
★ Rip currents are the ocean's biggest killer of humans. They happen when the sea is twisted as waves break differently on different parts of the shore.
|A Rip current with humans in the water !|
★ Under the Denmark Striat, a waterfall slowly cascades downward for over 3 kilometres —over three times as far as Angel Falls, in Venzuela, which is the tallest land waterfall.
★ For years, scientist wondered what creatures on the sae floor ate. The puzzle recently solved by the discovery of snot-like "stinkers" made by tiny tadpole —like creatures, which double the available food.
★ Some microbes can feed entirely on chemicals spewed up by seafloor volcanoes. They provide food for other deep sea creatures, such as giant clams.
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