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Parameter Tree:
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > LANDFORMS
Definition:
Many features that taken together make up the surface of the earth.
These include broad features, such as plain, plateau, and mountain, and
also minor features, such as hill, valley, slope, canyon, arroyo, and
alluvial fan. 
Reference:
Dictionary of Geological Terms, American Geological Institute, 1984.
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