A layer of rock just 520 million years old sat directly on top of ancient rock dating back 1.4 to 1.8 billion years.
Researchers have discovered chemical fingerprints of Earth's earliest incarnation, preserved in ancient mantle rocks. A unique imbalance in potassium isotopes points to remnants of “proto Earth” ...
The Moon may preserve a chemical record of Earth’s ancient atmosphere, and those same materials could one day support future lunar missions.
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