Dry quicksand was a mythical substance — normal-looking sand that could swallow you in a flash. That is, until 2004, when scientists made the stuff in a lab. (Mark told you about that development.)
In this video, geologist Matt Kuchta explains how dry quicksand is different from both wet quicksand and stable sand. Hint: Think "Jenga". Read the rest
The car in this photo was 13 kilometers northeast of Mount St. Helens when that volcano erupted on May 18, 1980. This photo was taken about a month later by researchers from the United States Geological Survey. At the Rosetta Stones blog, Dana Hunter has a really fascinating story — with more eerie photos — about why geologists would want to study totaled vehicles and what we can learn from machines that we can't learn from people. Read the rest
Here's a weird, great geological feature I spotted yesterday while out hiking in rural Oklahoma. We were out in a flat, flat plan that was dotted with a few tall, angular sandstone mounds and narrow sandstone canyons carved out by erosion. This rock was sticking out of the side of one of the mounds. It was the only place we saw anything like these vertical, tube-like structures, which stretched from the ground up to probably about my shoulder.
When I posted this image on Twitter yesterday, several people suggested that the tubes might be skolithos — tube-shaped fossils that were probably made by some kind of ancient worm creature and turn up sometimes in sandstones. While the pictures on Wikipedia don't look very similar to what I saw, there are apparently lots of different forms these things (and similar tube fossils) can take. Read the rest
One of the great mythologies of any kind of religious fundamentalist movement is that the beliefs of that movement, and the way they choose to interpret their scripture, represent some kind of true reflection of history. This is how things always were. It's the people who believe differently who changed.
But that's not necessarily true. Take fundamentalist Christianity. A few weeks ago, the Slacktivist blog had some excellent posts recently, documenting the fact that evangelicals were once pro-choice. Another great example comes from an article in the Geological Society of America Today — the magazine of the GSA.
Written by the University of Washington's David R. Montgomery, the piece traces the birth of modern Creationism and the way it has changed since the 19th century. In general, he writes, you can really think of Creationism as a response to geology — arising as a backlash against the rise of modern geology.
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The roots of modern creationism run directly back to George McCready Price (1870–1963), an amateur geologist with no formal training. In a book designed to look like a geology textbook, Price (1923) asserted that there was no order to the fossil record. Rejecting the idea of fossil succession, he argued that the succession of organisms that geologists read in the fossil record was really just a mixed-up sampling of communities that lived in different parts of the antediluvian world. He considered the fossil record too incomplete to confidently reconstruct the past, citing the occasional discovery of animals thought to be extinct and known only from fossils.
According to Academician Pokhilenko, "the value of impact diamonds is added by their unusual abrasive features and large grain size." "This expands significantly the scope of their industrial use and makes them more valuable for industrial purposes / in metalworking, in production of efficient semiconductors, etc./," he said. In addition, as yet, impact diamonds with similar specifications have not been discovered anywhere else in the world. Thus, experts speak about their extraterrestrial origin and claim that Russia becomes a monopoly owner of unlimited supplies of this unique raw material, which is of highly demand in advanced technologies. Scientists forecast, this raw material reserves "would be enough for the entire world for 3.000 years." Use of these minerals in the manufacturing industry is capable of a technical revolution.The diamonds are described as "extra-hard." #thatswhatshesaid Read the rest
In the 1990s, archaeologists found a mass grave in London, filled with more than 10,000 skeletons. There have been plenty of things over the centuries that could wipe out tons of Londoners en-masse—the Black Death, famine, fires, you name it. But this grave has turned out to be filled with victims of a far more unlikely natural disaster. Scientists now think those people were killed by a volcano.
Not a volcano in England, of course. But a massive eruption thousands of miles away.
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Scientific evidence – including radiocarbon dating of the bones and geological data from across the globe – shows for the first time that mass fatalities in the 13th century were caused by one of the largest volcanic eruptions of the past 10,000 years.
Such was the size of the eruption that its sulphurous gases would have released a stratospheric aerosol veil or dry fog that blocked out sunlight, altered atmospheric circulation patterns and cooled the Earth's surface. It caused crops to wither, bringing famine, pestilence and death.
Mass deaths required capacious burial pits, as recorded in contemporary accounts. In 1258, a monk reported: "The north wind prevailed for several months… scarcely a small rare flower or shooting germ appeared, whence the hope of harvest was uncertain... Innumerable multitudes of poor people died, and their bodies were found lying all about swollen from want… Nor did those who had homes dare to harbour the sick and dying, for fear of infection… The pestilence was immense – insufferable; it attacked the poor particularly.