Abrasion (geology)


Abrasion (geology)

Abrasion is mechanical scraping of a rock surface by friction between rocks and moving particles during their transport in wind, glacier, waves, gravity or running water, after friction, the moving particles dislodge loose and weak debris from the side of the rock, these particles can be dissolved in the water source.

The intensity of abrasion depends on the hardness, concentration, velocity and mass of moving particles.

Abrasion by a glacier

A glacier can "carve" a valley, cirque, or a tarn (glacial lake), by eroding rocks and soil and plucking them up. The rocks the glacier collects by plucking is then used as a tool to scrape even more debris from its environment. These glacial processes are very significant to the landscaping and erosion of earth, especially during the glacial periods.

Abrasion platform

A virtually smooth marine platform cut by the ocean waves at a coastline. If it is currently being fashioned it will be exposed only at low tide, but there is a possibility that the "wave-cut platform" will be hidden sporadically by a mantle of beach shingle, which is the abrading agent. If the platform is permanently exposed above high-water mark it is probably a raised-beach platform.


ee also

*Erosion
*glacial striation
*sedimentary


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Abrasion — may refer to: *Abrasion (medical), a wound consisting of superficial damage to the skin *Abrasion (dental), the loss of tooth structure by mechanical forces from a foreign element *Abrasion (geology), mechanical scraping of a rock surface by… …   Wikipedia

  • Geology of the Yosemite area — The exposed geology of the Yosemite area includes primarily granitic rocks with some older metamorphic rock. The first rocks were laid down in Precambrian times, when the area around Yosemite National Park was on the edge of a very young North… …   Wikipedia

  • Bunter (geology) — Bunter beds are sandstone deposits containing rounded pebbles, such as can notably be found in Warwickshire, Cheshire, Staffordshire, Nottinghamshire, Devon and Dorset in England. They are thought to be alluvial deposits and, judging from the… …   Wikipedia

  • glacial landform — ▪ geology Introduction  any product of flowing ice and meltwater. Such landforms are being produced today in glaciated areas, such as Greenland, Antarctica, and many of the world s higher mountain ranges. In addition, large expansions of present… …   Universalium

  • coastal landforms — ▪ geology Introduction       any of the relief features present along any coast, the result of a combination of processes, sediments, and the geology of the coast itself.       The coastal environment of the world is made up of a wide variety of… …   Universalium

  • detritus —    [ geology ]    A collective term for rock and mineral fragments occurring in sediments, that are detached or removed by mechanical means (e.g., disintegration, abrasion) and derived from pre existing rocks and moved from their place of origin …   Glossary of landform and geologic terms

  • Glacier — This article is about the geological formation. For other uses, see Glacier (disambiguation). The Baltoro Glacier in the Karakoram, Kashmir, Northern Pakistan. At 62 kilometres (39 mi) in length, it is one of the longest alpine glaciers on… …   Wikipedia

  • Marine terrace — A marine terrace, coastal terrace[1], raised beach or perched coastline is a relatively flat, horizontal or gently inclined surface of marine origin[2], mostly an old abrasion platform which has been lifted out of the sphere of wave activity… …   Wikipedia

  • sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

  • GEOGRAPHICAL SURVEY — Names The name Ereẓ Israel (the Land of Israel) designates the land which, according to the Bible was promised as an inheritance to the Israelite tribes. In the course of time it came to be regarded first by the Jews and then also by the… …   Encyclopedia of Judaism


We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.