Title: Oxygen A Four Billion Year History
Description: "The air we breathe is twenty-one percent oxygen, an amount higher than on any other known world. While we may take our air for granted, Earth was not always an oxygenated planet. How did it become this way? Oxygen is the most current account of the history of atmospheric oxygen on Earth"--
Subjects: Oxygen, SCIENCE / Earth Sciences / General, SCIENCE / Life Sciences / Ecology, SCIENCE / Earth Sciences / Meteorology & Climatology, Atmosphäre, Entstehung, Sauerstoff