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| Description: (b) Convection currents in Earth’s interior are responsible for pushing around rigid plates on its crust. New crust forms in oceanic rifts, where magma oozes upward between separating plates. Mountain ranges and deep oceanic trenches are formed where plates collide and crust sometimes sinks back into the interior. Note that not all tectonic plates move together or apart—some scrape against each other. Picture Stats: Views: 1053 Filesize: 159.49kB Height: 401 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15969 |