UCR Today (press release) | Oxygen levels were only 0.1 percent of today's levels for roughly billion ... Phys.Org The grains, deposited in shallow, nearshore settings in the ancient ocean, can capture the chromium isotope composition of river water draining the ancient continents. Those waters, in turn, can record ... "In other words, Earth's atmosphere couldn't ... Why Didn't Animals Appear Sooner in Earth's History? |
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