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.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
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

Pothole (landform)

From Wikipedia, the free encyclopedia

 An aerial photo of a prairie pothole with a road through the center
An aerial photo of a prairie pothole with a road through the center
 This is a circular pothole from Capitol Reef National Park
This is a circular pothole from Capitol Reef National Park
 River Orchy, Scotland, showing erosion potholes in bedrock
River Orchy, Scotland, showing erosion potholes in bedrock

Potholes, also known as caldrons, cisterns, ephemeral pools, tanks, tinajas, waterpockets, and weathering pits, are holes that were eroded away in bedrock.[1] They are most commonly found in desert environments such as the Colorado Plateau. A few well known potholes are found in Canyonlands National Park, Capitol Reef National Park, and Moab. The Prairie Pothole Region is an area of the northern Great Plains that contains thousands of shallow wetlands known as potholes.

Description

Potholes form on flat surfaces causing them to not have any active draining, for instance there are no streams draining the potholes.[2] They normally form on sandstone surfaces, but can be found on other rock types such as granite and limestone.[1] These rock types contain siliceous minerals. Potholes are capable of collecting water when it rains, freezing over when the weather gets cold, dry out in hotter weather, and can even contain some species of bacteria. Potholes range in size from a few centimeters to many meters in diameter. The cavities can be shallow or more than 15 meters deep, containing hundreds of liters of water.[1]

Expansion

Potholes can expand from erosion and weathering, water, wind, and permafrost, but the main activity of how potholes expand is from biological weathering. At one time the belief was that the only agents involved with the expansion of potholes were weathering.[1] Within the potholes is a various eco-system that contains bacteria such as cyanobacteria, fungi, and algae which can be referred as biofilm.[1] Potholes do not contain predators like fish or aquatic insects.[2] The biofilm breaks down some of the siliceous minerals in the pothole for nutrients resulting in furthering the weathering the pothole.[2] The organisms that live in the potholes have to tolerate rapid change in water temperature, pH, oxygen, carbon dioxide concentration, and ion concentration.[1]

References

  1. ^ a b c d e f Hughes, Kebbi A., "Bacterial Communities and their Influence on the Formation and Development of Potholes in Sandstone Surfaces of the Semi-Arid Colorado Plateau" (2012). University of Western Ontario - Electronic Thesis and Dissertation Repository. Paper 543. http://ir.lib.uwo.ca/etd/543
  2. ^ a b c Davis, Jim. "What are “Potholes” and how are organisms able to live in them?." Utah Geological Survey. N.p., n.d. Web. 9 Oct 2013. <http://geology.utah.gov/surveynotes/gladasked/gladpotholes.htm>.

See also

This page was last edited on 6 July 2017, at 23:52.
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.