Friday, December 31, 2010

GeoJeopardy! Fridays - Video Edition

Time for GeoJeopardy! Fridays, because it is the last day of the year. And because it is the last one of the year, I present a special Video version of GeoJeopardy!. Videos courtesy of j-archive.com

- Walking with Dinosaurs -

You might encounter a real Stegosaurus if you can go back to the late part of this geological period, a good one for dinosaurs



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Until the recent discovery of the Gigantotasaurus fossil, 3 tons bigger, T. rex was thought to be the largest dinosaur of this dietary class... aaaagh!


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The Stegosaurus' plates could have been used in mating, may have been for defensive purposes, or may have served as living solar panels and helped the dinosaur regulate this



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Named for its cattle-like horns, this 9-tonner whose name means "bull lizard" had the largest head of any known land animal


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If a bite that could puncture a car roof wasn't enough, T. rex's teeth have recesses where these live; if the bite didn't kill you, the infection would


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All the answers as well as any other previous GeoJeopardy! questions can be found over at my website by clicking the link.  Videos used in the questions are the ones originally presented in the clue and have been obtained from the Jeopardy! archive site j-archive.com.

Wednesday, December 29, 2010

Guest Post - Naturally Harmful Metals and Minerals

Next up in the in the guest blog domain is Eric Stevenson who wanted to write about how natural "stuff" could be potentially hazardous to one's health. Check it out below:

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Naturally Harmful: The Modern and Historical Use of Asbestos, Lead, and Mercury


When a substance is known as “naturally-occurring,” we have a tendency to think of it as something that is possibly beneficial, or at the very least benign – certainly not harmful. However, many metals and minerals that occur naturally in the Earth’s crust are toxic to humans. In some cases, their deadliness was known from the beginning; in others, their usefulness obscured or outweighed the symptoms that warned of their toxicity.

Asbestos
Asbestos was once considered a “miracle mineral.” Ancient Greek writers told stories of tablecloths that could simply be tossed in the fire after use, emerging not only unscathed, but cleaner and whiter than before. Medieval alchemists were so entranced with this material that they hypothesized it came from the hair of salamanders, which could walk through fire and survive. By the time of Marco Polo, however, people knew that asbestos was mined from the earth.

In 1820, an Italian scientist became the first to run a successful business based on asbestos products – fireproof clothing sold all over Europe. Soon after, many items began to incorporate asbestos into their design: stage curtains, gaskets and packing for steam engines, paint and tar paper, and cement. The inclusion of asbestos in construction materials would continue into the 1970s for the simple reason that asbestos was an incredibly effective flame retardant. No doubt countless lives were saved from fire.

However, this “miracle mineral” was not the safety boon it appeared to be. When asbestos-containing products sustain damage, tiny, needle-like fibers are released into the air. Once inhaled, these fibers can cause serious health problems, including lung scarring, asbestosis, and mesothelioma, a rare and deadly form of cancer. One reason this cancer is so dangerous is that mesothelioma symptoms can take anywhere from 20-50 years to surface after exposure, by which time the disease is often in its final stages. Because of these dangers, asbestos has largely been replaced with alternative fire-resistant substances in newly-manufactured construction materials.

Lead
A soft, malleable metal, lead is useful for its low melting point, high density, and resistance to corrosion. It was accessible and easily worked with, and therefore made the ideal medium for the famed plumbing system of the Roman Empire. Lead was not only used for pipes, but also as a component in coins, flatware, cosmetics, spermicide, and food seasonings.

However, even the ancient Romans understood that exposure to lead had serious health-related consequences. As we now know, even low levels of exposure can cause chronic lead poisoning. The dangers of acute lead poisoning were apparent in Renaissance Europe, where it may have been used in some royal assassinations. In modern times, lead was used as a fuel additive, despite early evidence that the vapors were toxic to the workers producing it.

Though lead was removed from gasoline – as well as other products like pipes and house paint – beginning in the mid-1970s, the metal continues to be used in products from car batteries to radiation shielding. Unlike asbestos, lead can still be found in many construction materials because it usually has to be ingested to be poisonous. Initial symptoms of lead poisoning – including headache, abdominal pain, memory loss, and kidney failure – may be confused with other conditions, though more severe neurological problems soon follow. Like asbestos, there is no amount of lead ingestion, however small, that is considered “safe.”

Mercury
Mercury is notable for being one of the few metals that exists as a liquid at room temperature. Historically, mercury had a wide variety of applications, from the practical (preserving wood, developing daguerreotypes) to the recreational (handheld games, fishing lures). Amazingly, both the ancient Chinese and the ancient Greeks thought of mercury as a substance that promoted good health and long life, and doctors continued to use it into the 20th century to treat conditions ranging from depression to constipation to syphilis.

In modern times, most people know mercury as the liquid in thermometers, though it is also found in other measurement devices such as barometers (air pressure) and sphygmomanometers (blood pressure). Thimerosal, an organomercury compound, has been used as a component in dental amalgam and a preservative in vaccines. The latter use triggered a controversy over the possible role of thimerosal in the development of autism, though the most recent studies do not support a link between the two. Regardless, the FDA reports that thimerosal has been phased out of nearly all vaccinations required for young children.

However, parents are right to be concerned about exposing their children to any form of mercury. The substance is extremely dangerous if ingested, inhaled, or absorbed through the skin. Like lead, mercury poisoning affects the central nervous system, resulting in symptoms as diverse as sensory impairment, lack of coordination, hallucinations, and social phobia. Despite the dangers, small amounts of mercury can still be found in certain cosmetics, fluorescent lamps, neon signs, and telescopes.

If you would like more information about any of these substances, please visit:

James E. Alleman and Brooke T. Mossman. “Asbestos Revisited.” Scientific American, 1997.
http://virlab.virginia.edu/Nanoscience_class/lecture_notes/Lecture_14_Materials/Asbestos_CNT/Sci%20Am%20-%20Asbestos%20Revisited%20-%20July%201997.pdf

Jack Lewis. “Lead Poisoning: A Historical Perspective.” EPA Journal, 1985.
http://www.epa.gov/history/topics/perspect/lead.htm

U.S. Food and Drug Administration. “Thimerosal in Vaccines.” FDA.org, 2010.

Tuesday, December 28, 2010

Geological Literature QotW

I finally have time to post some of the Quotes of the Week that I have been stockpiling. This one seems a rather odd quote in general. But to top it off, it was completely out of nowhere. This has absolutly nothing to do with the material preceding it in the paragraph. The last part of the article that this may have been in reference to was at least 10-11 pages previously. So it was rather out of nowhere, making it even more bizarre.
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Again, what?
"A cyclops will always have the nostrils above the single eye."

Alberch, P., 1989, The logic of monsters: Evidence for internal constraint in development and evolution: Geobios, v. 22, p. 21-57.
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Saturday, December 25, 2010

Merry Christmas!!

Some woman to my wife: "Nobody wants coal in their stocking."

Me in reply: "Umm, I do"


Here is to the holiday of geologists. Where we all wish for coal in our stockings.

Friday, December 24, 2010

GeoJeopardy! Fridays

Time for GeoJeopardy! Fridays, because it's a holiday. At least for some of us.
- Rocks for Jocks -

Geologists dig up and study these organic remains, whose name is from the Latin for "dug up"

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Slate is this type of rock, the result of alterations to existing rocks
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A speleologist studies caves; this is another name for a caver who explores caves as a hobby

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Until it's cooled, the object seen here was this substance



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2-word term for the branch of geology that studies the phenomenon of continental drift

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All the answers as well as any other previous GeoJeopardy! questions can be found over at my website by clicking the link.  Images used in the questions are not the ones originally presented in the clue but are my interpretation of what they might have been and still get across the intent of the clue. Images used are linked to their sources.

Thursday, December 23, 2010

Monday, December 20, 2010

Geology in Art?

I just heard about this pretty neat blog about Geology in Art. Figured I would mention it and put it on the blogroll to the left.

http://www.geologyinart.blogspot.com/

Friday, December 17, 2010

GeoJeopardy! Fridays

It is that time again for GeoJeopardy! Fridays, because I am so busy I almost forgot it was Friday.

- Gems and Minerals -

Old masters could grind up hematite or cinnabar to make shades of this primary color

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The ancients called jade lapis nephriticus, as they thought it a stone that could cure this organ's ailments

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You can find caledonite in this country that lent its ancient name to the mineral

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A beryl named for a New York financier isn't johnite or pierpontite, but this

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Antimony is the usual base of this dark eye shadow used by Middle Eastern women

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Saturday, December 11, 2010

Geology News of the Day

A follow up to my pevious news of th day, which states that the NASA scientists discovery of arsenic based lifeforms may not have been entirely accurate

Scientists poke holes in NASA’s arsenic-eating microbe discovery

Global warming (global climate change?) strikes again. And this time it may be fatal.

If an island state vanishes, is it still a nation?

Friday, December 10, 2010

GeoJeopardy! Fridays

It is that time again for GeoJeopardy! Fridays, because those of us in school need a distraction from Finals Week.

- Official State Dinosaurs & Fossils -

The Triceratops found in this state's Black Hills won official fossil status

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Montana's state fossil, the Maiasaura, had this type of mouth, like the platypus

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Haddonfield, in this Eastern state, was the site of the first "nearly complete" dinosaur find - a Hadrosaurus
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The teeth from Maryland's Astrodon were cut open in 1858 & revealed this pattern, hence its name

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Saurophaganax was named this state's official fossil in 2000 & you can see one at the Sam Noble Museum in Norman

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Monday, December 06, 2010

Geology News of the Day

Apparently the sealevel rise following the melting of the ice sheets was not as steady as originally though. Looks like it could have jumped up to 2.5 meters/century.

Global Sea-Level Rise at the End of the Last Ice Age Interrupted by Rapid 'Jumps'

Saturday, December 04, 2010

Friday, December 03, 2010

GeoJeopardy! Fridays

Time for GeoJeopardy! Fridays, because why not.
- The Earth -

The modified Mercalli scale ranks these 1-12: 1 - not felt except by few, 12 - total destruction

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We're in the holocene epoch of the quaternary period of the Cenozoic one of these

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Basalt is an igneous rock & rock salt is this type

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William Smith was the 1st to date rocks using these found within them

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The stratosphere includes this layer of the atmosphere that absorbs ultraviolet light

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Thursday, December 02, 2010

Geological Literature QotW

I have another Quote of the Week for ya from my readings. This one I think is self explanatory.

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"Although we have referred to relatively few examples, and with differing degrees of confidence, our model for climate distribution of shallow marine trace fossils appears to be robust."

As a peer of mine put it, "What?"

Goldring, R., Cadee, G.C., D'Alessandro, A., de Gibert, J.M., Jenkins, R., & Pollard, J.E., 2004, Climatic control of trace fossil distribution in the marine realm: In McIlroy, D., Ed., The application of ichnology to palaeoenvironmental and stratigraphic analysis: Geological Society, London, Special Publications, 228:77-92.
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