{"thcode":61,"term":{"code":106,"name":"landform","parent":94,"scope":"a geomorphic feature recognized as distinct from the surrounding terrain."},"uf":[],"bt":[{"code":94,"name":"feature type","parent":1,"scope":null},{"code":1,"name":"Marine Realms Information Bank (MRIB) keyword categories","parent":null,"scope":null}],"nt":[{"code":107,"name":"abyssal plain","parent":106,"scope":"large flat areas in the ocean basins."},{"code":108,"name":"atoll","parent":106,"scope":"ringlike island or islands surrounding a lagoon."},{"code":109,"name":"bank","parent":106,"scope":"used for either 1) the ground bordering a body of water or 2) an area of sea floor surrounded by deeper water."},{"code":110,"name":"basin","parent":106,"scope":"used for large topographic depressions, both subaerial and submarine; distinct from (but sometimes related to) sedimentary basins and structural basins."},{"code":111,"name":"bay","parent":106,"scope":"a recess in the shoreline, typically bounded by capes or headlands."},{"code":112,"name":"beach","parent":106,"scope":"a gently sloping shore, generally underlain by sand or gravel and subject to the action of waves and tides."},{"code":113,"name":"beach ridge","parent":106,"scope":"the ridge defining the landward limit of a current of former beach, often capped by dunes."},{"code":114,"name":"caldera","parent":106,"scope":"the crater formed by the collapse of a volcano."},{"code":115,"name":"canyon","parent":106,"scope":"a steeply walled valley formed by fluvial erosion."},{"code":116,"name":"cape","parent":106,"scope":"a prominent headland along the shore."},{"code":117,"name":"cave","parent":106,"scope":"a natural underground cavity or chamber."},{"code":118,"name":"cliff","parent":106,"scope":"a very steep, vertical, or overhanging slope."},{"code":119,"name":"coast","parent":106,"scope":"the distinctive terrain between the shore and inland areas; varies in width."},{"code":120,"name":"coastal barrier","parent":106,"scope":"relatively narrow, subaerial ridges parallel to the shore, formed by wind, waves, and longshore currents; includes both barrier islands (separated from mainland by a bay or lagoon) and spits (attached to the mainland)."},{"code":121,"name":"coastal plain","parent":106,"scope":"used for plains adjacent to a large body of water."},{"code":122,"name":"continental margin","parent":106,"scope":"the zone of transition between the continents and oceans, including the continental shelf, slope, and rise."},{"code":123,"name":"continental shelf","parent":106,"scope":"the gently sloping sea floor between the coast and the continental slope."},{"code":124,"name":"continental slope","parent":106,"scope":"the more steeply sloping sea floor seaward of the continental shelf."},{"code":125,"name":"cove","parent":106,"scope":"a recess in the shoreline smaller than a bay."},{"code":126,"name":"crater","parent":106,"scope":"used for both volcanic craters and impact craters."},{"code":127,"name":"creek","parent":106,"scope":"a stream that is smaller than a river."},{"code":128,"name":"deep sea fan","parent":106,"scope":"a fan composed of sediment deposited by turbidity currents."},{"code":129,"name":"delta","parent":106,"scope":"alluvial deposits at the mouth of a river."},{"code":130,"name":"dune","parent":106,"scope":"a mound or ridge of wind-blown sand."},{"code":131,"name":"escarpment","parent":106,"scope":"a steep slope separating two areas of flatter terrain."},{"code":132,"name":"estuary","parent":106,"scope":"the lower course of a river, subject to tides and mixing of fresh and salt water."},{"code":133,"name":"fjord","parent":106,"scope":"narrow, steep-sided ocean inlet representing a drowned glacial valley."},{"code":134,"name":"gulf","parent":106,"scope":"a recess in the shoreline larger than a bay."},{"code":135,"name":"harbor","parent":106,"scope":"a sheltered anchorage, natural or artificial."},{"code":136,"name":"hill","parent":106,"scope":"a topographic prominence smaller than a mountain."},{"code":137,"name":"inland sea","parent":106,"scope":"a shallow sea that is largely surrounded by land and has limited communication with the open ocean."},{"code":138,"name":"island","parent":106,"scope":"a relatively small landmass surrounded on all sides by water."},{"code":143,"name":"lagoon","parent":106,"scope":"a shallow body of water separated from the open ocean by barrier islands or coral reefs."},{"code":144,"name":"lake","parent":106,"scope":"a body of water surrounded by land and larger than a pond."},{"code":147,"name":"lava flow","parent":106,"scope":"used for either 1) streams of molten rock erupted from a volcanic vent or 2) the solidified products of such eruptions."},{"code":148,"name":"marsh","parent":106,"scope":"a wetland characterized by herbaceous plants."},{"code":149,"name":"mid-ocean ridge","parent":106,"scope":"ridge near the center of an ocean basin, where new oceanic crust is created by sea-floor spreading."},{"code":150,"name":"mountain","parent":106,"scope":"a topographic prominence larger than a hill."},{"code":152,"name":"mudbank","parent":106,"scope":"used for mudbanks along rivers or on the sea floor."},{"code":153,"name":"mudflat","parent":106,"scope":"used for tidal flats underlain by mud."},{"code":154,"name":"ocean","parent":106,"scope":"used for saltwater bodies larger than seas or lakes."},{"code":155,"name":"outcrop","parent":106,"scope":"a natural or artificial bedrock exposure."},{"code":156,"name":"peninsula","parent":106,"scope":"a narrow landmass surrounded by water on three sides but connected to the mainland."},{"code":157,"name":"plateau","parent":106,"scope":"an elevated, generally flat landform."},{"code":158,"name":"pond","parent":106,"scope":"a body of water surrounded by land and smaller than a lake."},{"code":159,"name":"reef","parent":106,"scope":"used for 1) shallow-water biotic reefs such as coral reefs, 2) biotic reefs preserved in the geologic record, and 3) rocky outcrops on the sea floor that create a hazard to navigation."},{"code":162,"name":"ridge","parent":106,"scope":"used generically for a narrow, prominent elevation in any physiographic setting."},{"code":163,"name":"ripple mark","parent":106,"scope":"a small, undulating bedform created by waves, currents, or wind."},{"code":164,"name":"river","parent":106,"scope":"a stream that is larger than a creek."},{"code":170,"name":"sand deposit","parent":106,"scope":"unconsolidated sand laid down by wind or water."},{"code":171,"name":"sand wave","parent":106,"scope":"a relatively large, undulating bedform created by currents."},{"code":172,"name":"sandbar","parent":106,"scope":"used for sandy ridges formed in rivers (by currents) and in nearshore marine environments (by wave action)."},{"code":175,"name":"sea stack","parent":106,"scope":"an exposed erosional remnant lying offshore."},{"code":173,"name":"seabed","parent":106,"scope":"the floor of a sea or ocean."},{"code":174,"name":"seamount","parent":106,"scope":"an undersea mountain, generally formed through volcanism."},{"code":176,"name":"shoal","parent":106,"scope":"a relatively shallow area in the bed of a sea, lake, or river."},{"code":177,"name":"shore","parent":106,"scope":"the boundary between an ocean, sea, or lake and the adjacent dry land."},{"code":178,"name":"sinkhole","parent":106,"scope":"a topographic depression created by collapse of the ground above a cave or cavern."},{"code":179,"name":"slough","parent":106,"scope":"generally used for a muddy channel or swampy depression near the coast."},{"code":180,"name":"sound","parent":106,"scope":"a relatively long ocean inlet separating an island from the mainland or connecting two larger bodies of water; wider than a strait."},{"code":181,"name":"strait","parent":106,"scope":"a relatively narrow waterway between two larger bodies of water."},{"code":182,"name":"stream","parent":106,"scope":"a body of flowing water, regardless of size."},{"code":183,"name":"submarine canyon","parent":106,"scope":"an underwater canyon crossing the continental shelf and slope."},{"code":184,"name":"swamp","parent":106,"scope":"a wetland characterized by woody plants."},{"code":185,"name":"terrace","parent":106,"scope":"bench-like landforms within river valleys or along the coast, often arranged in steps."},{"code":186,"name":"tidal flat","parent":106,"scope":"very gently sloping surface that is inundated at high tide."},{"code":187,"name":"tidal inlet","parent":106,"scope":"the narrow waterway between barrier islands that connects lagoon with open ocean."},{"code":188,"name":"trench","parent":106,"scope":"a narrow, steep-sided depression in subaerial or submarine topography."},{"code":189,"name":"trough","parent":106,"scope":"used for topographic depressions that are generally wider and more gently sloping than trenches."},{"code":190,"name":"valley","parent":106,"scope":"an elongate topographic low formed by fluvial erosion or tectonic action."},{"code":191,"name":"volcano","parent":106,"scope":"a crustal vent from which lava and other igneous products are erupted; term usually applied to a mountain created by repeated eruptions."},{"code":192,"name":"watershed","parent":106,"scope":"the land that contributes water and sediment to a stream; term may be used for drainage systems of any scale."},{"code":193,"name":"wetland","parent":106,"scope":"a low-lying area saturated with water."}],"rt":[]}