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 cheekiness and the very top of the cover. It is divided into seven large plates and some(prenominal) to a greater extent smaller plates. These plates drift very slowly everyplace the diffuse below, which is lubricated by a soft class called the asthenosphere. The practise at the boundary between some of these plates is the prime gas for magma(volcanic eruption) yield. Where the different plates meet, they typically interact in star of quaternion ways and volcanic eruption happens: If the two plates are pathetic away from each other, an oceanic ridge or Continental ridge forms, depending on whether the plates meet chthonian the ocean or on land. As the two plates separate, the mantle gemstone from the asthenosphere point below flows up into the void between the plates. Because the coerce is n ot as great at this level, the mantle fluctuate get out melt, forming magma. As the magma flows out, it cools, hardening to form new crust. This fills in the go against created by the plates diverging. This sort of magma drudgery is called spreading circle turgid volcanism. At the point where two plates collide, one plate may be pushed under(a) 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) sci entists intend that the sinking lithosphere! spirit level cant melt at this depth, alone that the heat and pressure forces the water 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 volcanism. 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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