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The geographic cycle, or cycle of erosion, is an idealized model that explains the development of relief in landscapes. [1] The model starts with the erosion that follows uplift of land above a base level and ends, if conditions allow, in the formation of a peneplain. [1]
Earth's surface is modified by a combination of surface processes that shape landscapes, and geologic processes that cause tectonic uplift and subsidence, and shape the coastal geography. Surface processes comprise the action of water, wind, ice, wildfire, and life on the surface of the Earth, along with chemical reactions that form soils and ...
The primary processes are mass wasting and the freeze and thaw cycle, [1] in which fallen snow gets compacted into firn or névé. The importance of the processes covered by the term nivation with regard to the development of periglacial landscapes has been questioned by scholars, and the use of the term is discouraged.
In geology, degradation refers to the lowering of a fluvial surface, such as a stream bed or floodplain, through erosional processes. [ 1 ] [ 2 ] Degradation is the opposite of aggradation . Degradation is characteristic of channel networks in which either bedrock erosion is taking place, or in systems that are sediment -starved and are ...
The boundaries between facies (and corresponding areas on the temperature v. pressure graph) are wide because they are gradational and approximate. [1] The area on the graph corresponding to rock formation at the lowest values of temperature and pressure is the range of formation of sedimentary rocks , as opposed to metamorphic rocks, in a ...
Headward erosion is a fluvial process of erosion that lengthens a stream, a valley or a gully at its head and also enlarges its drainage basin. The stream erodes away at the rock and soil at its headwaters in the opposite direction that it flows. Once a stream has begun to cut back, the erosion is sped up by the steep gradient the water is ...
Schematic of sediment accumulation (aggradation) in a river channel. The sediment is brown. The river is flowing on bedrock in the upper image, but because sediment was deposited over time the riverbed has risen.
Atolls like Atafu in Tokelau in the Pacific Ocean are landforms associated to tropical climate. No atoll exists outside the tropics. Climatic geomorphology is the study of the role of climate in shaping landforms and the earth-surface processes. [1] An approach used in climatic geomorphology is to study relict landforms to infer ancient ...
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