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Ab turn out Volcanoes The grounds surface is made of huge, slowly moving plates of contestation and roll about 10 km thick. Below that is a degree of hot magma, 200 km thick.  When the magma is able to snap the plates to the surface, you aspire a blowhole appearion. This happens where two plates collide or where they atomic number 18 thinner.  The magma is then called lava. When the lava gets hard, it forms rock and thats how the surge around releasees forms.  Inside the volcano the red stuff is called magma, once the volcano bursts, the magma is then called lava and tatty lava  Volcanos are formed by upwellings of magma deep under the earths surface. No one is quite for sure why magma rises in accredited areas, but when it does, it forms pockets which create push back per unit area on the rock of the Earths bile. When the pressure at bottom these pockets becomes sufficiently large, the magma forces itself through the crust to the surface of the earth and spills out as lava.

If the crust above the magma pocket is comparatively wan or has pre-established bloods for the magma to flow through, the magma will erupt relatively gently and form shield volcanos (such as the Mauna Loa volcano in Hawaii or the undersea volcanos on the Atlantic Rift). When the crust is relatively solid, however, lava may force its way up for a while, building a pyramid-like volcano around its primary(prenominal) channel, but this channel will eventually become block by grumous lava, and pressure will build to a much greater level, creating more violent eruptions when it releases (as happened with Mount St Helens and Krakat! oa).If you extremity to get a full essay, order it on our website: OrderCustomPaper.com

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