600 Million Years of|Earth, Water and Air

The face of the Earth has changed again and again in the course of millions of years. The continents are underway, they collide and break apart again. Also the atmosphere was not always as we breathe it today. The oxygene content and CO2 content varied. Large variations in a short time have always been connected with biological crises. The look into the past shows, that Earth, Water and Air have a history.

The world maps stem from Ron Blakey, Northern Arizona University. The graphic was produced from originals by Robert A. Berner, Yale University.