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How do weathering erosion and deposition reshape tectonic landforms?
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continental landform
Davis's proposed landscape-development states. The morphology shown is not actually time-indicative. For example, A could be a gully system in soft sediment or a canyon such as the Royal Gorge in Colorado, which is millions of years old. The ridge-ravine topography of B would normally develop under humid conditions, but the river meandering on alluvium indicates a prior or extraneous non-humid aggrading mechanism. The riverine plain of C implies a complex history of planation and aggradation in a current fluvial mode.
Tectonic processes, such as uplift and subsidence, build the primary structures of the Earth's crust, including mountains, plateaus, and rift valleys. While these forces create the initial relief, weathering, erosion, and deposition act as the "sculptors" that modify these features over time.12
These denudational processes reshape tectonic landforms in several ways:
- Reduction of Elevation: Erosion generally works to lower the elevation of tectonic features. In continent-continent collision zones, such as the Appalachian Mountains, erosion can eventually eliminate mountainous relief entirely.34
- Sculpting Profiles: While tectonics may build a mountain range, erosional processes—such as those driven by water, ice, and wind—carve the specific, unique profiles of individual peaks and ridges.14
- Deposition and Aggradation: In arid environments, the debris produced by weathering is often deposited in intermontane basins, leading to alluviated landscapes that merge with high plateaus.2
- Climate Interaction: The effectiveness of these processes depends heavily on climate. For example, humid or glacial environments can etch rocks into sharp, mountainous relief, whereas arid settings may favor planation and the filling of basins with sediment.2
Ultimately, the final appearance of a landform reflects a dynamic balance between the tectonic "stage set" and the ongoing, climatically controlled denudational systems.2