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Smithsonian Magazine on MSN5d
The Secrets of How Life Began May Be Hidden Inside the World’s Oldest RocksWe know Earth is old. Scientists estimate that our planet formed around 4.5 billion years ago. But how old is it exactly? And ...
"The Krokodillen rocks formed before Jezero Crater was created, during Mars' earliest geologic period, the Noachian, and are ...
Geologists recently dated the age of Watersmeet gneiss, a type of rock in the Upper Peninsula, as the oldest in the U.S. Here ...
A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.
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