Gravity brought together the different kinds of rocks together and thus also held it together. In the process the denser material was accreted in center followed by lighter materials on top of it. This kind of process gave rise to very dense metallic core and subsequent mantle and then crust on boundary of earth and space. Action of gravity with mechanical heat generated during accretion process has helped in creating flows which has differentiated the earths internal structure.
Apr 27th, 2015
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