Associate Professor of Geology, Iowa State University
I am a biogeochemist with expertise in anoxic aquatic systems. I study microbial processes that transform inorganic chemical species, particularly metals such as iron. I am interested in the rise of oxygen on Earth, and photosynthetic organisms that drove environmental evolution.
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What the Supreme Court is doing right in considering Trump’s immunity case
Will Solomon Islands’ new leader stay close to China?
IceCube researchers detect a rare type of energetic neutrino sent from powerful astronomical objects