1Continental MarginsOcean BasinsHMS Challenger2Passive ActivePassive MarginActive Margin3Monterey CanyonOrigin of Submarine Canyons• Erosion by streams and rivers• Ice ages and glaciers - lower sea level• Erosion by turbidity currents• Turbidity currents = great masses ofsediment-laden water that are pulled downslope by gravitySea Level410 ft. lower140 meters4Turbidity Currents5Aseismic RidgesGuyotsGuyots6Continental Magmatic Arc7Island ArcOcean Island VolcanoesHot Spots8Fringing and Barrier Reefs,Atolls and Plate Tectonics9Barrier Coral ReefFringing Coral ReefAtoll Coral
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