{"thcode":3,"term":{"code":1010,"name":"seafloor features","parent":816,"scope":null},"uf":[{"name":"arrugados","usewith":false},{"name":"banks (seafloor)","usewith":false},{"name":"benches (seafloor)","usewith":false},{"name":"holes (seafloor)","usewith":false},{"name":"moats (seafloor)","usewith":false},{"name":"ocean floor features","usewith":false},{"name":"ramps (seafloor)","usewith":false},{"name":"rises (seafloor)","usewith":false},{"name":"seachannels (seafloor)","usewith":false},{"name":"shelf valleys (seafloor)","usewith":false},{"name":"subsea features","usewith":false},{"name":"tongues (seafloor)","usewith":false},{"name":"underwater features","usewith":false}],"bt":[{"code":816,"name":"physiographic features","parent":1,"scope":null},{"code":1,"name":"Categories","parent":null,"scope":null}],"nt":[{"code":2,"name":"abyssal features","parent":1010,"scope":"Features on the ocean floor at a depth of 3500 - 6000 meters. [Adapted from Glossary of Geology, 4th ed.]"},{"code":249,"name":"continental margins","parent":1010,"scope":"Ocean floor between the shoreline and the abyssal ocean floor. [Glossary of Geology, 4th ed.]"},{"code":421,"name":"fracture zones","parent":1010,"scope":"Elongated zones of unusually irregular topography on the deep-sea floor that often separate regions of different depths [Glossary of Geology, 4th ed.]"},{"code":527,"name":"hydrothermal vents","parent":1010,"scope":"Cracks along a rift or ridge in the deep ocean floor that spews out water heated to high temperature by the magma under the Earth's crust. [Columbia Electronic Encyc., 1999]"},{"code":756,"name":"ocean trenches","parent":1010,"scope":"Narrow, elongate depressions of the deep-sea floor associated with a subduction zone. They are oriented parallel to volcanic arcs and commonly to the edge of the continent, between the continental margin and the abyssal hills. [Glossary of Geology, 4th ed.]"},{"code":1011,"name":"seamounts","parent":1010,"scope":"Elevations of the sea floor, 1000 m or higher, either flat-topped (guyots) or peaked (seapeaks). [Glossary of Geology, 4th ed.]"},{"code":1106,"name":"submarine canyons","parent":1010,"scope":"Steep-sided, V-profile valley often heading in the continental shelf running down the continental slope, having tributaries and resembling unglaciated, river-cut land canyons. [Glossary of Geology, 4th ed.]"}],"rt":[{"code":921,"name":"reefs","parent":816,"scope":"Chains of rocks or coral at or near the surface of water. [USGS Circ 1048]"},{"code":952,"name":"ridges","parent":710,"scope":"Elevations with a narrow, elongated crest which can be part of a hill or mountain. [USGS Feature Class Definitions <http:\/\/geonames.usgs.gov\/domestic\/feature_class.htm>]"},{"code":1197,"name":"valleys","parent":816,"scope":"Low-lying land bordered by higher ground; especially elongate, relatively large gently sloping depressions of the Earth's surface, commonly situated between two mountains or between ranges of hills or mountains, and often containing a stream with an outlet. [Glossary of Geology, 4th ed.]"}]}