Search results
Results from the WOW.Com Content Network
Furthermore, chemical and physical weathering often go hand in hand. For example, cracks extended by physical weathering will increase the surface area exposed to chemical action, thus amplifying the rate of disintegration. [6] Frost weathering is the most important form of physical weathering. Next in importance is wedging by plant roots ...
Abrasion is a process of weathering that occurs when material being transported wears away at a surface over time, commonly occurring with ice and glaciers. The primary process of abrasion is physical weathering. Its the process of friction caused by scuffing, scratching, wearing down, marring, and rubbing away of materials.
Spheroidal weathering has often been incorrectly attributed solely to various types of physical weathering. [1] [2] [5] Frequently, erosion has removed the layers of altered rock and other saprolite surrounding corestones that were produced by spheroidal weathering. This leaves many corestones as freestanding boulders on the ground's surface.
The silicate sand grains from which they form are the product of physical and chemical weathering of bedrock. [7] Weathering and erosion are most rapid in areas of high relief, such as volcanic arcs, areas of continental rifting, and orogenic belts. [8]
Haloclasty (also called salt weathering) is a type of physical weathering caused by the growth and thermal expansion of salt crystals. The process starts when saline water seeps into deep cracks and evaporates depositing salt crystals. When the rocks are then heated, the crystals will expand putting pressure on the surrounding rock which will ...
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate
Starting in the 1970s, most workers have advocated salt weathering as the primary explanation for the formation of tafoni. Currently, tafoni are considered to be polygenetic in origin being the result of complex interaction of physical and chemical weathering processes, which include salt weathering and cyclic wetting and drying. [1] [4]
In such cases, the loosening and detachment of blocks appears to result from a combination of (1) chemical and physical weathering along joints, (2) hydraulic wedging driven by smaller rock fragments getting into existing cracks, (3) crack propagation from stresses caused by impacts of large clasts already in transport by the river, and ...