TUG MEMBERS: Joining TUG does not automatically register you as a user of the TUG Bulletin Board. You must register yourself.


*ads are disabled when logged in as a member*
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. The TUGBBS forums are completely free and open to the public and exist as the absolute best place for owners to get help and advice about their timeshares for more than 24 years!

    Join tens of thousands of other owners just like you here to get any and all Timeshare questions answered!
    Dismiss Notice
  3. Sign up to get the TUG Newsletter for free! Join tens of thousands of other owners who get this every week! Latest resort reviews and the most important topics discussed by owners during the week!
    Dismiss Notice
  4. TUG is trying out a new program that will trade you a TUG membership for a Timeshare resort review if you are an expired member, or even just a guest here on the forums!

    Read more here
    Dismiss Notice
  5. Our official "end my sales presentation early" T-shirts are available again! Also come with the option for a free membership extension with purchase to offset the cost!

    Read more Here
    Dismiss Notice
  6. Follow the TUG Member Banner as it travels the world on vacation with Timeshare owners! Also sign up to get the banner sent to you so you can submit a photo of your vacation with the banner to share with TUG! Banner Thread
    Dismiss Notice
  7. A few of the most common links here on the forums for newbies and guests!
    Dismiss Notice

Oxygen Had to Fight a 'War' for Earth's Atmosphere

Discussion in 'TUG Lounge' started by MULTIZ321, Jul 12, 2018.

  1. MULTIZ321

    MULTIZ321 TUG Member

    Joined:
    Jun 6, 2005
    Messages:
    13,371
    Likes Received:
    649
    Trophy Points:
    348
    Location:
    FT. LAUDERDALE, FL
    Resorts Owned:
    BLUEWATER BY SPINNAKER HHI
    ROYAL HOLIDAY CLUB RHC (POINTS)
    Oxygen Had to Fight a 'War' for Earth's Atmosphere
    By Peter Kelley, University of Washington/ Oxygen/ Science and Technology/ Futurity/ futurity.org

    'Earth’s oxygen levels rose and fell more than once hundreds of millions of years before the planet-wide success of the Great Oxidation Event about 2.4 billion years ago, according to new research.

    The evidence comes from a new study that indicates a second and much earlier “whiff” of oxygen in Earth’s distant past—in the atmosphere and on the surface of a large stretch of ocean—showing that the oxygenation of the Earth was a complex process of repeated trying and failing over a vast stretch of time....."

    [​IMG]
    The Jeerinah Formation in Western Australia, where researchers found a sudden shift in nitrogen isotopes. “Nitrogen isotopes tell a story about oxygenation of the surface ocean, and this oxygenation spans hundreds of kilometers across a marine basin and lasts for somewhere less than 50 million years,” says lead author Matt Koehler. (Credit: Roger Buick/U. Washington)


    Richard
     

Share This Page