lunes, 16 de abril de 2012

Fosa de las Marianas

La fosa de las Marianas es la más profunda fosa marina conocida y el lugar más profundo de la corteza terrestre. Tiene su origen en un proceso desubducción. Se localiza en el fondo del Pacífico noroccidental, al sureste de las islas Marianas, cerca de Guam
Challenger Deep in the Mariana Trench is the deepest point in Earth's oceans. The bottom there is 10,924 meters (35,840 feet) below sea level. If Mount Everest, the highest mountain on Earth, were placed at this location it would be covered by over one mile of water. The Challenger Deep is named after the British survey ship Challenger II, which discovered this deepest location in 1951. The Challenger Deep was first explored by Jacques Piccard and Don Walsh in the Trieste bathyscaphe in 1960. They reached a depth of 10,916 meters (35,814 feet). In 2009 researchers from Woods Hole Oceanographic Institution completed the deepest dive by an unmanned robotic vehicle in the Challenger Deep. Their Nereus robotic vehicle reached a depth of 10,902 meters. 
The Mariana Trench is located at a convergent plate boundary. Here two converging lithospheric plates collide with one another. At this collision point, one of the plates descends into the mantle. At the line of contact between the two plates the downward flexure forms a trough known as an ocean trench. An example of an ocean trench is shown in the diagram below. 

Mas información en: