maandag 15 augustus 2005

Model Gives Clearer Idea Of How Oxygen Came To Dominate Earth's Atmosphere

Model Gives Clearer Idea Of How Oxygen Came To Dominate Earth's Atmosphere
But Claire said that just changing the model to reflect different iron content in the outer crust makes a huge difference in when the model shows free oxygen filling the atmosphere. Increasing the actual iron content fivefold would have delayed oxygenation by more than 1 billion years, while cutting iron to one-fifth the actual level would have allowed oxygenation to happen more than 1 billion years earlier.