CO2 Rocks!

When reviewing the history of the Earth’s atmosphere it is fascinating that at first it was all atmosphere and no Earth. And that atmosphere was mainly hydrogen. Then due to the implacable nature of gravity enough of it got together to form our hot Sun, while other items within what has been called the “Frost Belt” agglomerated into the rocky planets. Of which the Earth eventually became the most accommodating to life. Over immense time, this hospitality changed the atmosphere and the rocks. Additions to the original hydrogen came from hot rocks outgassing mainly nitrogen and some carbon dioxide. Moreover, hot rocks have been a continuing source of CO2.  And then life was initiated by very early forms of bacteria, which with photosynthesis provided not just oxygen but converted CO2 to food. All on the way to forming cool rocks.