The land below us is always in motion. nurse home tectonics studies these restless effects to hand us a better understanding of the priming coat and its past. stark naked break up rocks atomic number 18 poured bulge out in the form of magma from the mid-ocean ridges. The rock is recycled and re-entered back into the macrocosm in deep ocean trenches through convection current. The convection current in the winding-sheet drives nursing homes around either against or away from individually other. These collisions give rise to earthquakes, volcanoes, mountains, and continental drift. The crashing and spreading of the plates forms the landscape of the populace as we see it today. The positions of the land masses today is a termination of continental drift. During the demesnes existance, the magnetic field form never been stable. curdled magma containing magnetic imprints reveal periods of time when the Earths magnetic fields throw off actually been reversed. Â Â Â Â Â Â Â Â Approximately 4.55 zillion years ago, the Earth was undecomposed a ball of molten material. Since then, parts of the Earth have cooled forming the solid crust- chill. This process has been occurring for roughly about 3.8 billion years. The mantle is about 2900 km. thick, which lies above a layer of molten magma that facilitate exists today. The immense heat from the magma (approximately 2700(C) cooks convection in the mantle (Figure 1).
Convection is caused by non-uniform temperature in a fluid and density differences. This continuous convection is the cause of plate movement. Each complete cycle, called a convection cell, drives the plate i! n the nidus of the cell. How does a solid mantle move? The mantle whitethorn be solid but, as with most solids, it will grow if vast term stress is applied; ...like Silly apply which seeps into the rug when left unattended, mantle material flows when subjected to small long-term stresses.1 Â Â Â Â Â Â Â Â Presently, there... If you require to get a full essay, order it on our website:
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