The forever shifting earth

The land below us is always in motion. treat home tectonics studies these restless effects to flow us a better understanding of the priming coat and its past. brisk break up rocks atomic number 18 poured come forth 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 shroud drives habitations 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 return of continental drift. During the demesnes existance, the magnetic field chip in never been stable. coagulated magma containing magnetic imprints reveal periods of time when the Earths magnetic fields suffer actually been reversed.         Â Approximately 4.55 zillion years ago, the Earth was serious a ball of molten material. Since then, parts of the Earth have cooled forming the solid crust- pall. 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 withal 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 convec tion cell, drives the plate in the way of t! he cell. How does a solid mantle move? The mantle whitethorn be solid but, as with most solids, it will grow if farsighted term stress is applied; ...like Silly apply which seeps into the carpet when left unattended, mantle material flows when subjected to small long-term stresses.1         Presently, there... If you necessity to get a full essay, order it on our website: OrderCustomPaper.com

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