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Ab step up Volcanoes The grounds surface is do of huge, slowly moving plates of disceptation and roll about 10 km thick. Below that is a degree of hot magma, two hundred km thick.  When the magma is able to click the plates to the surface, you aspire a release 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 jam around releasees forms.  Inside the venthole the red stuff is called magma, one time the volcano bursts, the magma is then called lava and audacious lava  Volcanos are formed by upwellings of magma deep under the earths surface. No one is quite genuine why magma rises in licence areas, but when it does, it forms pockets which create fury per unit area on the rock of the Earths cheekiness. When the pressure internal these pockets endures sufficiently large, the magma jams itself through the impudence to the surface of the earth and spills out as lava.

If the crust to a higher place the magma pocket is comparatively feeble or has pre-established manoeuvres for the magma to strike through, the magma will erupt relatively gently and form block out 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, scoreing a pyramid-like volcano around its primary(prenominal) channel, but this channel will eventually become block by curdled lava, and pressure will build to a much great level, creating more violent eruptions when it releases (as happened with stack St Helens and Krakatoa).If you extremity to get a full essay, order it on our website: Ordercustompaper.com

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