A slope may look stable, but that doesn't mean it will always be
stable. The same geologic material can, under certain circumstances, lose its strength and integrity. Here, a geologist demonstrates how this might happen with the help of a tired kitteh
. Read the rest
In the 1870s, a French geographer proposed digging a canal from the Mediterranean to flood a low-lying part of the Sahara Desert
. He pitched it as good for business and good for local environments, writes Ron Miller at i09. But I can't help but think of Plagues and Pleasures of the Salton Sea
— a documentary about the development, culture, and slow, ongoing destruction of a salty, inland sea
that accidentally formed in southern California in the first part of the 20th century. Read the rest
Mars' landscape was formed by flowing water, and the proof is in the pebbles
. [BBC] Read the rest
Earlier this month, volcanologists blew 12 holes in an otherwise peaceful meadow in Ashford, New York
. It's not that they had anything against the meadow, per se, it's just that it was a convenient place to do some real-world experiments in how explosions affect the Earth and what we can do to monitor and predict volcanic eruptions. Read the rest
Short answer: We don't know
. What makes this story by Erin Wayman interesting is the way it carefully breaks down an almost Hollywood-ready narrative and finds the fascinating uncertainty lurking underneath. The truth is, uncertainty is cool. Because it means there's more stuff left to discover. Read the rest
Why build a normal, weak sand castle, when you could have a defensible sand fortress?
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
Under the right conditions, veins of gold can form in just a few tenths of a second
, writes Richard Lovett at Nature News. The key is the massive changes in below-ground pressure that can accompany an earthquake. Under the right conditions, water vaporizes, leaving behind crystallized minerals. Read the rest
Sixty feet under the Gulf of Mexico lie the remains of an 50,000-year-old forest
. Diver and photographer Ben Raines took some amazing photos of the site and sent samples of the trees — which still look like trees — to the Lawrence Livermore National Laboratory for radiocarbon dating. You can see sap in a cross-section of the wood and, when it's cut, Raines says it still smells like fresh cypress. Read the rest
If you were horrifically fascinated (horrafinated?) by the sinkhole that swallowed Floridian Jeff Bush and his entire bedroom a week ago, you might be interested in some sinkhole science. The US Geological Survey says that sinkholes are a geologic thing. Certain areas of the country are more prone than others (which you probably knew already). But the formation of actual sinkholes in those sinkhole-prone environments can apparently be prompted by human activities, ranging from old mines that weaken the ground above them; to groundwater pumping that destabilizes the soil; to (get this) leaky faucets. The USGS does not say how many leaky faucets, or how bad a leak, it might take to trigger a sinkhole
, but the basic idea is that saturating usually dry soil could cause it to shift, so you'd assume it would have to mean a lot of water leaking into the soil under the house. Read the rest
On February 20th, 1943, Dionisio Pulido watched as a crack in his farm field collapsed in on itself and began to vomit out ash, rock, and fire. The birth of Mexico's Parícutin volcano is a story I've heard before, but I really enjoyed Dana Hunter's two-part series on the occasion of its 70th volcanaversary. Her posts really get into the perspective of Pulido and other local residents in a way I haven't seen in other accounts, and she does an amazing job of giving you a sense of just how well-documented the birth of this volcano was and why that fact matters so much. Here's Part 1
and Part 2
. 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
The United States Geological Survey has an interesting FAQ report on dowsing
— the practice of attempting to locate underground water with divining rods. It's got some interesting history and comparisons between dowsing and modern hydrology. The part on evidence for and against dowsing, though, is pretty sparse. If you want more on that, The Skeptic's Dictionary has some deeper analysis
. The basic gist — what little research there has been suggests the successes of dowsing aren't any better than chance. (Via an interesting piece by Mary Brock at Skepchick about dowsing in the wine industry.) 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
What construction crews could learn from your high school science class, and more great earth science videos.
Here is a detailed analysis of the amount of time it would take to ride a hypothetical elevator down through the Earth's core and back out the other side of the planet
. Apparently, this has something to do with the remake of Total Recall. But it's interesting even if (like me) you have no intention of seeing that movie. (Via Rhett Allain
) 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.
Read the rest
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.