GEOL 212 Quiz: Mid Ocean Ridges Quiz on Subduction zones (Divergent and Convergent Plate Boundaries), Pre Midterm Prep
26 Dec 2017
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Mid ocean ridges: subduction zones (divergent and convergent. Old oceanic lithosphere is up to 100 km thick, while at the axis of a mid-oceanic ridge, it may be only ten km thick. Plate tectonics was only a partial vindication of wegener"s continental drift. It was different in that the continents are merely passengers riding on mobile plates, and do not drift across the earth"s crust by themselves. Three types of plate boundaries: divergent: boundaries at which plates move apart i i. e. sea- floor spreading zones. These are sites of active oceanic lithosphere formation and are marked topographically by mid- oceanic ridges: example: the boundary of the arabian and african plates in the. Red sea: divergent boundaries originate when continents rife apart to form new ocean basins. In its early stages, such rifting manifests as a series of long rift valleys like those of east africa.
