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Science & Technology

"Snowball Earth" theory confirmed

By T.K. Randall
March 7, 2010 · Comment icon 2 comments

Image Credit: NOAA
A new find showing that the equator was once covered in ice is being hailed as proof of a snowball Earth.
The theory is based on the idea that Earth was once covered in a planetwide ice age, natural global warming through volcanism would have helped to thaw the ice. The new discovery demonstrates that in support of this idea the equator was once covered in ice as well.
Earth's now steamy Equator was covered with ice 716 million years ago, according to a new study. The finding appears to add solid evidence to the theory of an ancient "snowball Earth." The discovery hinged on proving that the right rocks had been covered by glaciers in the right place at the right time.


Source: National Geographic | Comments (2)




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Recent comments on this story
Comment icon #1 Posted by Jaygatz 14 years ago
Yeah thats no surprise. The earth is changing all the time!!! Sure it takes 100's of thousands of years, but still. When I was in Yukon a few years back I found out that they found Palm tree Fossils In Alaska and Yukon. At one time The north was a tropical place.
Comment icon #2 Posted by Leonardo 14 years ago
I don't know that I agree with the conclusion. I accept that they found deposits which were volcanically and glacially deposited and that these deposits formed in the then equatorial region. However, there is (still) a glacier on Mt Kilimanjaro. There are glaciers in the Rwenzori Range which straddle the Congo-Uganda border. There are glaciers in the Peruvian Andes. Unless the deposits found can be verified as having formed at low altitude (and I can't tell if they have), then there are other explanations which are probably more likely than 'Snowball Earth'.


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