GEOL107 Study Guide - Final Guide: Divergent Boundary, Continental Crust, Convergent Boundary
29 Aug 2016
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Abyssal hills: crust moving away from mid-ocean ridge is cooling and sinking (ocean depth increasing), also faulted (mostly normal faults), crust is slowly being covered by oceanic sediments. Abyssal plains: crust continuing to move away from mid-ocean ridge is cooling and sinking (ocean depth increasing), crust completely covered by oceanic sediment, smooth (little relief), flattest portions of ocean floor. Deep-ocean trenches: occur at convergent plate boundaries where oceanic lithosphere is being subducted, long, linear, deepest depths in the oceans occur here. Seamounts: underwater volcanoes occur individually or as chains. Guyots: flat-topped seamounts erosion by waves when seamount was near/at ocean surface. Continental margins: transition between deep ocean floor and land divided into 3 zones: continental shelf, continental slope, continental rise. Continental shelf: extends from shoreline to water depths of 100-300 meters, gentle slopes, can be exposed as land during glacial time periods.
