Tag Archives: O2 molecules

Breathing new life into Earth

Today, oxygen takes up a hefty portion of Earth\’s atmosphere: Life-sustaining O2 molecules make up 21 percent of the air we breathe. However, very early in Earth\’s history, O2 was a rare — if not completely absent — player in the turbulent mix of primordial gases. It wasn\’t until the \”Great Oxidation Event\” (GOE), nearly […] … learn more→