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| Description: Origin of Magma Magma originates when essentially solid rock, located in the crust and upper mantle, melts Factors that influence the generation of magma from solid rock Role of heat Earth’s natural temperature increases with depth (geothermal gradient) is not sufficient to melt rock at the lower crust and upper mantle Picture Stats: Views: 266 Filesize: 805.72kB Height: 921 Width: 1015 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39620 |