Plate

Scientists developed a revolutionary theory called plate tectonics. tectonic plates are in the lithosphere described as a degree of rigid material composed of the outer resentment and the very top of the cover. It is divided into seven large plates and some(prenominal) more smaller plates. These plates drift very slowly everyplace the chimneypiece below, which is lubricated by a soft class called the asthenosphere. The employment at the boundary between some of these plates is the prime gun for magma(volcanic eruption) yield. Where the different plates meet, they typically interact in star of iv ways and volcanic eruption happens: If the two plates are abject away from each other, an maritimeic ridge or Continental ridge forms, depending on whether the plates meet chthonian the ocean or on land. As the two plates separate, the blanket gemstone from the asthenosphere tier below flows up into the void between the plates. Because the coerce is non as great at this level, the mantle fluctuate volition melt, forming magma. As the magma flows out, it cools, hardening to form new crust. This fills in the disruption created by the plates diverging. This sort of magma deed is called spreading circle number volcanism. At the point where two plates collide, one plate whitethorn be pushed at a lower place the other plate, so that it sinks into the mantle. This process, called subduction, typically forms a trench, a very deep ditch, usually in the ocean floor. As the rigid lithosphere pushes down into the hot, high-pressure mantle, it heats up. galore(postnominal) scientists regard that the sinking lithosphere work cant melt at this depth, entirely that the heat and pressure forces the wet system (the surface water and water from hydrated minerals) out of the plate and into the mantle layer above. The increased water content lowers the melting point of the mantle rock in this wedge, causing it to melt into magma. This sort of magma production is called subduction zone volcani! sm. If the plates collide and neither plate can subduct under the other,...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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