Two billion years ago the Earth system was recovering from perhaps the single-most profound modification of its surface environments: the oxygenation of the atmosphere and oceans. This led to a series of major changes in global biogeochemical cycles, as a team around Aivo Lepland of the Norwegian Geological Survey NGU reports in the latest online edition of "Nature Geoscience".
Fuente : http://www.eurekalert.org/pub_releases/2013-11/ggp...
Fuente : http://www.eurekalert.org/pub_releases/2013-11/ggp...