Current Events

  • Irish Chronicles Document Links Between Volcanoes and Weather
    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong corr...Read more

    x

    Irish Chronicles Document Links Between Volcanoes and Weather

    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong correlation between the occurrence of volcanic eruptions and extreme cold weather in Ireland over a 1200 year period. Data analyzed in this study cover the period from 431 to 1649, during which time up to 48 volcanic eruptions are identified in Greenland ice core records through deposition of volcanic sulfate in annual layers of ice. You can find the study (open access), published on 6 June 2013 in IOP Publishing's journal Environmental Research Letters, at http://iopscience.iop.org/1748-9326/8/2/024035/article. Find out more about how volcanoes can influence climate.
  • EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US
    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, acco...Read more

    x

    EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US

    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, according to the National Weather Service in Norman Oklahoma. The tornado, which remained on the ground for 40 minutes and reached 2.6 miles across (4.2 km), took the lives of 18 people including storm chasers Tim Samaras, Paul Samaras and Carl Young. For more information on the tornado, visit http://ow.ly/i/2hfDG.
  • Atmospheric CO2 Level Tops 400 ppm
    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

    x

    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.
These wonderfully balanced rocks mark a tomb in Wales.
Click on image for full size
Photo courtesy Diego Meozzi/Stone Pages

Pentre Ifan Dolmen Tomb

The stone structures of England and France are very famous. But, there are also stone structures in Wales, Sweden, Germany, Portugal, Spain, and Russia. The most popular site in Wales is Pentre Ifan.

Pentre Ifan is a Dolmen structure. A Dolmen structure is a burial place made out of big stones and those stones are often balancing on top of one another to form an arch or a fort-like structure. Here you can see the one large rock balanced on three upright stones. All of the stones are local igneous rocks. The large stone on top weighs over 16 tons and is held eight feet off the ground!

Pentre Ifan can be found near the town of Fishguard in Wales. It is thought to be from around 3,500 B.C.

Many times, archeologists and archeoastronomers will look at the orientation of a structure to see if it is aligned towards the setting or rising of the Sun, Moon or certain star on a special day like a solstice. Pentre Ifan isn't aligned in any of these special ways.

Since this site is so old, archeologists haven't found many ancient artifacts. Human bones were not found here, but archeologists are sure that this served as a common burial ground for the people who built it.

Local legend has it that fairies are sometimes seen at Pentre Ifan. They are described as "little children in clothes like soldiers' clothes with red caps." The mystery of stone sites often breeds such stories as this.

Last modified September 19, 2000 by Jennifer Bergman.

Shop Windows to the Universe Science Store!

The Summer 2010 issue of The Earth Scientist, available in our online store, includes articles on rivers and snow, classroom planetariums, satellites and oceanography, hands-on astronomy, and global warming.

Windows to the Universe Community

News

Opportunities

You might also be interested in:

Cool It! Game

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

The Stonehenge Monument

There are over 900 rings of stone located in the British Isles. The most famous of these stone rings is of course, Stonehenge. Stonehenge lies in Wiltshire, England. Stonehenge is so mysterious that it...more

The Stones of Carnac

The stones of Carnac, France, are probably the most famous stones markings outside of those found at Stonehenge in England. There are many, many stones at Carnac. And these stones are very old too, the...more

Megaliths Revealed

Many people are interested in the mysterious megalithic structures that can be found around the world. A megalithic structure is a ancient monument made of large stones. Megalith comes from Greek; "mega"...more

The Stones of Fossa

The stone structures of England and France are very famous. In Italy, you'll also find standing stones, stone rings, and stone tombs. An example of these stone structures is in Fossa, Abruzzo, in Italy....more

Native American Astronomy

People from Asia crossed the Bering Strait into North America. These people were first in this new land and so they are known as Native Americans. Over time, these people broke into tribes (as seen on...more

Archeoastronomy

"The movements of the heavenly bodies are an admirable thing, well known and manifest to all peoples. There are no people, no matter how barbaric and primitive, that do not raise up their eyes, take note,...more

The Cairns of Clava

Not too far from Loch Ness, there lies three giant tombs made of stones. They are called the Balnuaran of Clava. The Balnuaran of Clava, giant tombs encased in stone, can be found close to Inverness in...more

Shop Windows to the Universe

Warnings: The True Story of How Science Tamed the Weather by Mike Smith tells the story of our storm warning system. See our online store book collection.

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF