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| Description: Plate Tectonics and Igneous Activity Plate motions provide the mechanism by which mantle rocks melt to form magma Divergent plate boundaries The greatest volume of volcanic rock is produced along the oceanic ridge system Lithosphere pulls apart Less pressure on underlying rocks Partial melting occurs Large quantities of fluid basaltic magma are produced Picture Stats: Views: 270 Filesize: 1.29MB Height: 582 Width: 1339 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39625 |