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In geology and geomorphology a pediplain (from the Latin pes, genitive case pedis, meaning "foot") is an extensive plain formed by the coalescence of pediments. [1] The processes through which pediplains forms is known as pediplanation . [ 2 ]
Gilbert is considered one of the giants of the subdiscipline of geomorphology, having contributed to the understanding of landscape evolution, erosion, river incision, and sedimentation. He was a planetary science pioneer, correctly identifying lunar craters as caused by impacts, and carrying out early impact-cratering experiments. [ 7 ]
Pediment surface at base of Book Cliffs, Utah A pediment , also known as a concave slope or waning slope , [ 1 ] is a very gently sloping (0.5°–7°) inclined bedrock surface. [ 2 ] It is typically a concave surface sloping down from the base of a steeper retreating desert cliff , escarpment , [ 3 ] or surrounding a monadnock or inselberg ...
Abrasion leads to surface-level destruction over a period of time, whereas attrition results in more change at a faster rate. Today, the geomorphology community uses the term "abrasion" in a looser way, often interchangeably with the term "wear". [4]
In geology and geomorphology a base level is the lower limit for an erosion process. [1] The modern term was introduced by John Wesley Powell in 1875. [ 1 ] The term was subsequently appropriated by William Morris Davis who used it in his cycle of erosion theory.
In geology and geomorphology, a hogback or hog's back is a long, narrow ridge or a series of hills with a narrow crest and steep slopes of nearly equal inclination on both flanks. Typically, the term is restricted to a ridge created by the differential erosion of outcropping , steeply dipping (greater than 30–40°), homoclinal , and typically ...
In geography, hydrography, and fluvial geomorphology, a thalweg or talweg (/ ˈ t ɑː l v ɛ ɡ /) is the line or curve of lowest elevation within a valley or watercourse. [1] Its vertical position in maps is the nadir (greatest depth, sounding ) in the stream profile .
Geodesy or geodetics [1] is the science of measuring and representing the geometry, gravity, and spatial orientation of the Earth in temporally varying 3D.It is called planetary geodesy when studying other astronomical bodies, such as planets or circumplanetary systems. [2]