CAS ES 142 Chapter 3-4: ES142 Ch 3 and 4
30 Jul 2018
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Continental margins: the edges of continents and the container sides of the deep ocean basins, includes regions called the continental shelf, slop, and rise. Continental shelves: submerged, shallow extensions of continents stretching from the shoreline seaward to a break in slope of the seafloor. Underlain by granitic crust, covered with a wedge of sediment. Widest shelves: region surround the arctic ocean. Narrow shelves: eastern margin of pacific ocean. Continental slopes: mark the edge of the continental shelves. In ocean/continent convergences: the slop may contain oceanic sediment. Continental rises: formed from the transport of sediment down continental slopes and its accumulation in an apron-like fashion at the base of the slope. Not found where the continental borderlands coincide with subduction zones. In these regions, rises are placed by deep sea trenches (mariana trench) Submarine canyons: the conduit through which sediment is delivered to continental rises. Usually incised into the edge of continental shelves, extend down the continental slope to the rise.
