GEL 20 Study Guide - Final Guide: Juan De Fuca Plate, Convergent Boundary, Magma Chamber
Document Summary
B/r (b/r) extends n-s from eastern oregon into mexico, and e-w from the eastern front of the. Extension is essentially stretching where tectonic stresses are directed away from each other. The direction of extension in the b/r is east to west. Plate boundaries where 2 plates spread apart to create new lithosphere are called divergent boundaries. Primary example of divergent boundaries is the mid oceanic ridge system. Mid oceanic ridge that runs up the middle of the atlantic ocean. Mid oceanic ridge that runs up the middle of the paci c ocean. The axis of mid oceanic ridges that cross each other. This is where the process of underwater volcanism occurs. When new ocean oor eventually gets displaced laterally to either side of a mid ocean ridge as newer molten material rises along fractures in the rift valley. This is how ocean basins progressively widen of time. When a continent splits and separates into 2 separate continents.
