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| Description: Deep-Ocean Basins Deep-ocean trenches Long, relatively narrow features Deepest parts of ocean Most are located in the Pacific Ocean Sites where moving lithospheric plates plunge into the mantle Associated with volcanic activity Volcanic island arcs Continental volcanic arcs Ocean Basin Floor Abyssal plains Likely the most level places on Earth Sites of thick accumulations of sediment Found in all oceans Seamounts and guyots Isolated volcanic peaks Many form near oceanic ridges Seamounts and guyots May emerge as an island May sink and form flat-topped seamounts called guyots or tablemounts The Oceanic Ridge Mid-ocean ridge Characterized by An elevated position Extensive faulting Numerous volcanic structures that have developed on newly formed crust Mid-ocean ridge Interconnected ridge system is the longest topographic feature on Earth’s surface Over 70,000 kilometers (43,000 miles) in length Twenty-three percent of Earth’s surface Winds through all major oceans Along the axis of some segments are deep downfaulted structures called rift valleys Mid-ocean ridge Consist of layer upon layer of basaltic rocks that have been faulted and uplifted Mid-Atlantic Ridge has been studied more thoroughly than any other ridge system Picture Stats: Views: 569 Filesize: 164.59kB Height: 815 Width: 740 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39458 |