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| Description: Origin of Magma Factors that influence the generation of magma from solid rock Partial melting Igneous rocks are mixtures of minerals Melting occurs over a range of temperatures Produces a magma with a higher silica content than the original rock Plate Tectonics and Igneous Activity Global distribution of igneous activity is not random Most volcanoes are located on the margins of the ocean basins (intermediate, andesitic composition) Second group is confined to the deep ocean basins (basaltic lavas) Third group includes those found in the interiors of continents Picture Stats: Views: 282 Filesize: 1.67MB Height: 689 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39623 |