Mariana Trench: Record-breaking journey to the bottom of the ocean - BBC News

The Mariana Trench, located in the Pacific Ocean, gradually reveals its mysteries as you explore. The last cartography, dating from 2012, made it possible to specify the value of the greatest depth of the oceans, until then little known. The deepest place in the world, named Challenger Deep, would thus be 10,994 meters deep.
The tectonic plates are in constant motion . They originate at the level of ocean ridges . As they move away from this area, and therefore as they age, their density gradually increases. During a collision, the one with the highest density slips under the second, it is subduction . The presence of oceanic trenches marks the areas where this phenomenon takes place.
The subduction of the Pacific Plate under the Philippine Plate gave birth to the Mariana Trench (2,500 km long). The deepest point of the Planet, named Challenger Deep , can be observed there. The density of the peaceful plate, 180 million years old, is so high at this point that it sinks into the Earth's mantle almost vertically.

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