Keyword: earthscience

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  • Ancient bubbles in Australian rocks show early Earth's air weighed less (trunc)

    05/11/2016 12:34:28 AM PDT · by blueplum · 39 replies
    The Telegraph UK ^ | 10 May 2016 04:37am | Chiara Palazzo, Sydney
    Full title: Ancient bubbles in Australian rocks show early Earth's air weighed less than half today's atmosphere Air bubbles trapped in 2.7 billion-year-old Australian rock suggest the Earth's atmosphere weighed less than half of today and was much thinner than previously thought. Researchers analysed the size of air bubbles that formed at the top and bottom of lava flows along the Beasley River in Western Australia's Pilbara region almost three billion years ago and used the data to calculate the atmospheric pressure at the time. The results suggest that the air at the time exerted at most half the pressure...
  • California Irrigation Changing Weather Patterns in American Southwest

    02/02/2013 11:15:45 PM PST · by neverdem · 34 replies
    ScienceNOW ^ | 1 February 2013 | Sid Perkins
    Enlarge Image Thanks, California! Massive amounts of irrigation in California's Central Valley boost summer precipitation across the American Southwest and during that period increases runoff into the Colorado River, which flows through the Grand Canyon, by an average of 28%, a new study suggests. Credit: iStockphoto/Thinkstock Water diverted to central California's farmlands boosts rainfall in nearby states and may even exacerbate periodic flooding in some regions, a new study suggests. The phenomenon may also be happening elsewhere in the world. California's Central Valley—an area almost twice the size of Massachusetts where farmers raise more than 200 different crops, including...
  • Geomagnetic data reveal unusual nature of recent solar minimum

    03/19/2012 1:00:56 PM PDT · by Ernest_at_the_Beach · 17 replies
    watts up with that? ^ | March 19, 2012 | Anthony Watts
    From the American Geophysical Union weekly highlights:Key Points Minimum 23-24 showed recurrence intervals of 9.0 and 6.7-dHistorical geomagnetic activity data show that minimum 23-24 was unusualThe heliosphere during minimum 23-24 had unusual sectorial structure Since the mid-1800s, scientists have been systematically measuring changes in the Earth’s magnetic field and the occurrence of geomagnetic activity. Such long- term investigation has uncovered a number of cyclical changes, including a signal associated with 27-day solar rotation. This is most clearly seen during the declining phase and minimum of each 11-year solar cycle, when the Sun’s magnetic dipole is sometimes tilted with respect to...
  • Earth’s magnetic field is not produced by an internal dynamo within the planet

    10/27/2009 8:12:33 AM PDT · by mudblood · 69 replies · 2,315+ views
    Dennis Brooks ^ | 2009 | Dennis Brooks
    The New Theory: Earth’s magnetic field is not produced by an internal dynamo within the planet. The magnetic field and the planet are separate parts of a complex dynamo system surrounding the planet. The system includes the planet, the magnetic field, radiation belts, and ring current. The same is true of the other planets. Saturn, Jupiter, Neptune, and Uranus are visible components of otherwise invisible planetary dynamo systems, which are all housed within a magnetosphere. According to this new theory, there is no internal dynamo within the planet. Planet Earth does not have a unique way of producing it’s magnetic...
  • Water in Mantle May be Associated with Subduction (More water below oceans than in?)

    08/30/2009 2:39:28 PM PDT · by decimon · 69 replies · 2,105+ views
    Oregon State University ^ | August 19, 2009 | Unknown
    CORVALLIS, Ore. – A team of scientists from Oregon State University has created the first global three-dimensional map of electrical conductivity in the Earth's mantle and their model suggests that that enhanced conductivity in certain areas of the mantle may signal the presence of water. What is most notable, the scientists say, is those areas of high conductivity coincide with subduction zones – where tectonic plates are being subducted beneath the Earth's crust. Subducting plates are comparatively colder than surrounding mantle materials and thus should be less conductive. The answer, the researchers suggest, may be that conductivity in those areas...
  • Earth Is Smaller Than Assumed

    07/07/2007 3:14:06 AM PDT · by neverdem · 74 replies · 1,638+ views
    Science Daily — Although the discrepancy is not large, it is significant: Geodesists from the University of Bonn have remeasured the size of the Earth in a long lasting international cooperation project. The blue planet is accordingly some millimeters smaller than up to now assumed. The results are important, for example, to be able to demonstrate a climate contingent rise in sea level. View of the Earth as seen by the Apollo 17 crew traveling toward the moon. (Credit: Image courtesy of NASA/Johnson Space Center) The system of measurement used by the Bonn Geodesists is invisible. It consists of radiowaves...
  • Distinguished Professors

    05/18/2006 7:57:54 AM PDT · by JSedreporter · 312+ views
    Accuracy in Academia ^ | May 18, 2006 | Malcolm A. Kline
    When students sign up for college courses, they are not only responding to the catalogue course description. They know that the background and expertise of the instructor plays a part in the educational experience. It may be true that, as Penn State President Graham Spanier told the Philadelphia Inquirer, “There’s no national test that Penn State Students could take that’s going to help us educate them better or make us more accountable.” Nonetheless, professors nationwide have said some very revealing things, and if you take a class schedule, broken down by departments or subjects, and insert them accordingly, you get...
  • Professor Limbaugh Debunks Junk Earth Science (Creation/evolution linked to environmentalism)

    09/06/2005 7:02:43 AM PDT · by DaveLoneRanger · 113 replies · 3,316+ views
    Rush Limbaugh | August 10, 2005 | Rush Limbaugh
    BEGIN TRANSCRIPT RUSH: We go to Whitney in Roanoke, Virginia. I'm glad you held on, Whitney. Thanks for your patience. CALLER: Oh, thanks for having me. RUSH: You bet. CALLER: I had a rational and intelligent argument, but now I'm a little nervous. I'm not sure how I'm going -- ha! ha! -- to present it, but it seems like to me that you just dismiss the environmental concerns just right offhand, and what I'm trying to figure out is: Are you dismissing the harbingers of doom and gloom themselves, or the environmental concern? RUSH: Uhhh. Am I just missing...
  • Earth's Core Spins Faster Than the Rest of the Planet

    08/25/2005 8:20:46 PM PDT · by neverdem · 57 replies · 831+ views
    NY Times ^ | August 25, 2005 | KENNETH CHANG
    As the earth turns, the center of the earth turns even faster. Confirming assertions first made in 1996, a team of geophysicists are presenting data in the journal Science today showing that the earth's inner core, a ball of solid iron larger than the moon, spins faster than the rest of the planet. Over a period of 700 to 1,200 years, the inner core appears to make one full extra spin. That extra spin could give scientists information about how the earth generates its magnetic field. The inner core, 1,500 miles wide, sits at the center of the planet, ensconced...
  • Researchers Change Opinion on Earth's Age

    06/07/2003 3:50:41 AM PDT · by Pharmboy · 111 replies · 772+ views
    Reuters ^ | Thu Jun 5 | Anon Stringer
    WASHINGTON - The Earth became a major planetary body much earlier than previously believed, just 10 million years after the birth of the sun, researchers say. Experts now believe that the inner solar system planets — Mercury, Venus, Earth and Mars — actually began forming within 10,000 years after the nuclear fires of the sun were ignited about 4.5 billion years ago, says Stein B. Jacobsen, author of an analysis appearing Friday in the journal Science. Early in its life, the sun was surrounded by clouds of dust and gas. This material slowly clumped together into larger and larger pieces....
  • Is The Earth Preparing To Flip?

    03/27/2003 9:40:41 PM PST · by Davea · 57 replies · 647+ views
    BBC | 03/27/03
    Last Updated: Thursday, 27 March, 2003, 12:02 GMT Is the Earth preparing to flip? By Dr David Whitehouse BBC News Online science editor Finding the shifting magnetic pole It is not just the plot for a far-fetched science-fiction disaster movie. Something unexplained really is happening to the Earth's magnetic field. In recent years, the field has been behaving in ways not previously seen in the admittedly short time it has been monitored. Some researchers think it may presage a geomagnetic reversal when the north and south magnetic poles flip. Such speculation takes place as the science-fiction movie The Core goes...
  • Geology Picture of the Week, June 9-15, 2002

    06/12/2002 8:20:23 AM PDT · by cogitator · 3 replies · 173+ views
    Link post: Geology Picture of the Week, June 9-15, 2002