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| Description: Plate Tectonics and Igneous Activity Plate motions provide the mechanism by which mantle rocks melt to form magma Convergent plate boundaries Descending plate partially melts Magma slowly rises upward Rising magma can form Volcanic island arcs in an ocean (Aleutian Islands) Continental volcanic arcs (Andes Mountains) Picture Stats: Views: 246 Filesize: 1.12MB Height: 462 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39624 |