The oxygen content increased when the Earth was covered in ice
Published 7 February 2017 Ice landscape (Photo: Svante Björck) In the beginning, planet Earth was a very inhospitable place with no oxygen and only single-celled bacteria as inhabitants. According to a new study, the oxygen content in the air began to increase about 2.4 billion years ago, at the same time as the global glaciation and when all continents were gathered in a single huge landmass, or
https://www.lunduniversity.lu.se/article/oxygen-content-increased-when-earth-was-covered-ice - 2025-07-03