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 bitterness and the very top of the cover. It is divided into seven large plates and some(prenominal) more than smaller plates. These plates drift very slowly everyplace the drape below, which is lubricated by a soft class called the asthenosphere. The natural process at the boundary between some of these plates is the prime catalyst for magma(volcanic eruption) yield. Where the different plates meet, they typically interact in star of cardinal ways and volcanic eruption happens: If the two plates are despicable 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 winding-clothes gemstone from the asthenosphere floor below flows up into the void between the plates. Because the co erce is non as great at this level, the mantle fluctuate impart melt, forming magma. As the magma flows out, it cools, hardening to form new crust. This fills in the crack created by the plates diverging. This sort of magma output signal is called spreading circle expatiate volcanism. At the point where two plates collide, one plate whitethorn be pushed nether 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(p ostnominal) scientists cerebrate that the s! inking lithosphere storey cant melt at this depth, save that the heat and pressure forces the piddle 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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