Featured Research

from universities, journals, and other organizations

From Cornstarch To The Giant's Causeway

Date:
December 28, 2001
Source:
University Of Michigan
Summary:
For centuries people have been fascinated by enormous columnar rock formations like the Devil's Postpile in California. The Celts, for example, were convinced that Giant's Causeway, in Northern Ireland, was the work of the famous giant, Finn McCool. Later, in 1693, the Philosophical Society of London heard a report from an expedition to the site, concluding that the mysterious rock formation was in fact the result of natural causes, though the authors declined to speculate on precisely which ones were involved. Modern scientists know that, in fact, the great columns of basalt were formed by cooling lava, but the actual process that produced their very regular polygonal shapes has never been completely understood.

ANN ARBOR --- For centuries people have been fascinated by enormous columnar rock formations like the Devil's Postpile in California. The Celts, for example, were convinced that Giant's Causeway, in Northern Ireland, was the work of the famous giant, Finn McCool. Later, in 1693, the Philosophical Society of London heard a report from an expedition to the site, concluding that the mysterious rock formation was in fact the result of natural causes, though the authors declined to speculate on precisely which ones were involved. Modern scientists know that, in fact, the great columns of basalt were formed by cooling lava, but the actual process that produced their very regular polygonal shapes has never been completely understood.

Related Articles


A pair of physicists, working on the cusp between physics and geology, have developed an explanation for these splendid formations. Alberto G. Rojo of the University of Michigan and Eduardo A. Jagla of the Centro Atσmico Bariloche in Argentina postulate that as the lava cooled, fractures formed at the surface and moved downward. At the top the fracture pattern looked like the familiar arrangement that we see in drying mud or in paint---a random pattern of curved lines meeting at 90-degree angles. But as the fractures moved downward they began to take the path of least resistance. The configuration that minimizes the energy required to penetrate the interior turns out to be quasi-hexagonal---a regular pattern of hexagons, pentagons, and heptagons, as in the Giant's Causeway. The results of their research will appear in the Jan. 1, 2002, issue of the American Physical Society journal, Physical Review E.

The researchers support their theory with a computer model of the process, along with a simple cornstarch experiment that anyone can do at home. Mix equal amounts of cornstarch and water and spread the mixture 1-2 cm thick on a flat, glass-bottomed surface, like a Pyrex pie-plate. After a few hours, as the mixture dries, it will start fracturing. First a series of large cracks will form from top to bottom. Then a small, irregular array of fractures will be seen at the top surface. But after a few days, when you turn the plate over, you will see that by the time they have reached the bottom, the small cracks have formed a patchwork, quasi-hexagonal pattern. Keeping the dish warm (under a 40W light bulb, for instance) helps the process along.

"Many scientists believe that the cutting edge of physics exists only at the very small scale (string theory, for example) or the very large (cosmology and astrophysics)," Rojo says. "I disagree. Many fundamental open questions and mysteries still remain at the scale of our everyday experience. Patterns, both in inanimate and in living natural objects represent just one of those questions."


Story Source:

The above story is based on materials provided by University Of Michigan. Note: Materials may be edited for content and length.


Cite This Page:

University Of Michigan. "From Cornstarch To The Giant's Causeway." ScienceDaily. ScienceDaily, 28 December 2001. <www.sciencedaily.com/releases/2001/12/011221081225.htm>.
University Of Michigan. (2001, December 28). From Cornstarch To The Giant's Causeway. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2001/12/011221081225.htm
University Of Michigan. "From Cornstarch To The Giant's Causeway." ScienceDaily. www.sciencedaily.com/releases/2001/12/011221081225.htm (accessed November 23, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, November 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

AFP (Nov. 21, 2014) — Toyota presented its hydrogen fuel-cell compact car called "Mirai" to US consumers at the Los Angeles auto show. The car should go on sale in 2015 for around $60.000. It combines stored hydrogen with oxygen to generate its own power. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Google Announces Improvements To Balloon-Borne Wi-Fi Project

Google Announces Improvements To Balloon-Borne Wi-Fi Project

Newsy (Nov. 21, 2014) — In a blog post, Google said its balloons have traveled 3 million kilometers since the start of Project Loon. Video provided by Newsy
Powered by NewsLook.com
Raw: Paralyzed Marine Walks With Robotic Braces

Raw: Paralyzed Marine Walks With Robotic Braces

AP (Nov. 21, 2014) — Marine Corps officials say a special operations officer left paralyzed by a sniper's bullet in Afghanistan walked using robotic leg braces in a ceremony to award him a Bronze Star. (Nov. 21) Video provided by AP
Powered by NewsLook.com
British 'Bio-Bus' Is Powered By Human Waste

British 'Bio-Bus' Is Powered By Human Waste

Buzz60 (Nov. 21, 2014) — British company GENeco debuted what its calling the Bio-Bus, a bus fueled entirely by biomethane gas produced from food scraps and sewage. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins