The air we breathe is twenty-one percent oxygen, an amount higher than on any other known world.
Canfield guides readers through the various lines of sci.
How did it become this way? Donald Canfield--one of the world\'s leading authorities on geochemistry, earth history, and the early oceans--covers this vast history, emphasizing its relationship to the evolution of life and the evolving chemistry of the Earth.
While we may take our air for granted, Earth was not always an oxygenated planet.
The air we breathe is twenty-one percent oxygen, an amount higher than on any other known world