To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

From Wikipedia, the free encyclopedia

 Soil with broken rock fragments overlying bedrock, Sandside Bay, Caithness
Soil with broken rock fragments overlying bedrock, Sandside Bay, Caithness

In geology, bedrock is the lithified rock that lies under a loose softer material called regolith at the surface of the Earth or other terrestrial planets. The broken and weathered regolith includes soil and subsoil. The surface of the bedrock beneath the soil cover is known as rockhead in engineering geology,[1][2] and its identification by digging, drilling or geophysical methods is an important task in most civil engineering projects. Superficial deposits (also known as drift) can be extremely thick, such that the bedrock lies hundreds of meters below the surface.[3]

Bedrock may also experience subsurface weathering at its upper boundary, forming saprolite.

A solid geologic map of an area will usually show the distribution of differing bedrock types, rock that would be exposed at the surface if all soil or other superficial deposits were removed.[4]

 Soil profile with bedrock labeled R
Soil profile with bedrock labeled R

Soil scientists use the capital letters O, A, B, C, and E to identify the master soil horizons, and lowercase letters for distinctions of these horizons. Most soils have three major horizons: the surface horizon (A), the subsoil (B), and the substratum (C). Some soils have an organic horizon (O) on the surface, but such a horizon can also be buried. The master horizon, E, is used for subsurface horizons that have a significant loss of minerals (eluviation). Hard bedrock, which is not soil, uses the letter R.

See also

References

  1. ^ Price, David George, Engineering Geology: Principles and Practice, Springer, 2009, p. 16 ISBN 978-3540292494
  2. ^ Gribble C. & McLean A. (2003). Geology for Civil Engineers. CRC Press. p. 113. ISBN 9780203362150. 
  3. ^ "Swinford, E. Mac What the glaciers left behind – drift thickness map of Ohio, Ohio Department of Natural Resources, Division of Geological Survey, newsletter 2004, No.1" (PDF). Archived from the original (PDF) on 2012-10-02. Retrieved 2012-09-12. 
  4. ^ BGS. "Digital Geology – Bedrock geology theme". Archived from the original on 13 December 2009. Retrieved 2009-11-12. 

External links

  • Media related to Bedrock at Wikimedia Commons
This page was last edited on 16 June 2018, at 00:02.
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.