Name: Asphalt Lake

Definition:
A natural pool of liquid asphalt.

CC: DA005

Name: Alkali Flats

Definition:
A sterile plain containing an excess of alkali usually occurring in the bottom of an under drained basin in an arid or semi-arid region. The ground may be soft and have low shearing and bearing strength, and a high organic content.

CC: DA006

Name: Ground Surface Element

Definition:
The surface soil characteristics of the terrain.

CC: DA010

Name: Barren Ground

Definition:
Ground so disturbed as to have no identifiable vegetation cover (e.g., grass or shrubs).

CC: DA020

Name: Land Area

Definition:
An area not permanently or temporarily covered by water.

CC: DA030

Name: Land Region

Definition:
An area of natural scenery on land. It is defined by its geographical characteristics and known by its proper name.

CC: DA031

Name: Terrain

Definition:
The ground surface, which may or may not be covered by water, which may be capable of elaboration or separation into individual object types based on status/type grouping information which was unable to be determined at the time of classification assignment.

CC: DA040

Name: Bluff / Cliff / Escarpment

Definition:
A steep, vertical, or overhanging face of rock or earth. (See also FAULT .)

CC: DB010

Name: Cave

Definition:
A natural subterranean chamber or series of chambers open to the terrain surface.

CC: DB030

Name: Hill

Definition:
A small, isolated elevation, smaller than a mountain.

CC: DB031

Name: Mountainous Region

Definition:
A region whose physiography consists predominantly of mountains.

CC: DB050

Name: Valley Region

Definition:
A region of low land lying between hills or mountains and often having a river or stream flowing through it.

CC: DB055

Name: Crevice / Crevasse

Definition:
A narrow fissure, crack, or rift in the surface of the terrain, or the overlying snow or ice cover.

CC: DB060

Name: Terrain Cut

Definition:
An excavation of the terrain surface to provide passage for a road, railroad, canal, etc.

CC: DB070

Name: Terrain Depression

Definition:
A low area surrounded by higher ground.

CC: DB080

Name: Terrain Crater

Definition:
A localized depression surrounded by higher ground, resulting from an explosion or the impact of a large or high-velocity projectile upon the terrain.

CC: DB081

Name: Embankment / Fill

Definition:
A raised long mound of earth or other material. (See also DYKE_CROWN .)

CC: DB090

Name: Esker

Definition:
A long, narrow ridge of sand and gravel deposited by a glacial stream.

CC: DB100

Name: Fault

Definition:
A fracture in the terrain surface with displacement on one side of the fracture relative to the other. (See also BLUFF_OR_CLIFF_OR_ESCARPMENT .)

CC: DB110

Name: Geothermal Object

Definition:
A localized terrain surface characteristic controlled by or derived from the heat of the planetary interior.

CC: DB115

Name: Miscellaneous Obstacle

Definition:
Obstacle which is of a minor nature and which is not included in a more specific characterization.

CC: DB145

Name: Mountain Pass

Definition:
A natural route through a low place in a mountain range. (See also MOUNTAINOUS_REGION .)

CC: DB150

Name: Rock Strata / Rock Formation

Definition:
A visual topographic outcrop, layers or beds of rock. (See also LARGE_ISOLATED_ROCK_OR_BOULDER_OR_ROCKY_FORMATION .)

CC: DB160

Name: Large Isolated Rock, Boulder or Rocky Formation

Definition:
A conspicuous isolated rocky formation or single large stone existing in its entirety above the high water mark. From offshore it would appear to a mariner as a single point on land and would be appropriate for use in navigation. (See also ROCK_STRATA_OR_ROCK_FORMATION .)

CC: DB161

Name: Sand Dune / Sand Hills

Definition:
Ridges or hills of sand.

CC: DB170

Name: Slope Category

Definition:
An area enclosing a group of slope values falling within a set range.

CC: DB176

Name: Volcano

Definition:
A mountain or hill, often conical, formed around a vent in the terrain surface through which molten rock, ash, or gases are or have been expelled.

CC: DB180

Name: Volcanic Dike

Definition:
A steep ridge of igneous rock.

CC: DB190

Name: Gully / Gorge

Definition:
A long, narrow, deep erosion with steep banks.

CC: DB200

Name: Potential Landslide Area

Definition:
A mass of land with a high potential of slipping down from a mountain, hill, etc.

CC: DB210

Name: Landslide

Definition:
The mass of earth or rock which has slipped down from a mountain or cliff.

CC: DB211

Name: Undermined Land

Definition:
Area undermined through mining activities that has already partly subsided or that is in the process of subsiding.

CC: DB220

Name: Alluvial Fan

Definition:
A gently sloping fan shaped terrain surface configuration usually found near the lower termination of a canyon.

CC: DB230

Name: Bottomline of Cliff

Definition:
Line representing the demarcation of a sudden and significant change in the gradient of the terrain relief occurring at the bottom of a steep slope.

CC: DB500

Name: Topline of Cliff

Definition:
Line representing the demarcation of a sudden and significant change in the gradient of the terrain relief occurring at the top of a steep slope.

CC: DB501