Scientists recently unveiled the nation's newest "oldest known" rock — discovered in Michigan's Upper Peninsula. Michigan, Minnesota and Wisconsin all feature ancient rocks known as gneisses — ...
A new analysis of rocks thought to be at least 2.5 billion years old helps clarify the chemical history of Earth's mantle -- the geologic layer beneath the planet's crust. The findings hone scientists ...
In the absence of oxygen, methane may have been the most abundant greenhouse gas in Earth’s atmosphere, reaching a stable balance between a greenhouse and anti-greenhouse until oxygen producing single ...
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