Nitrogen may have arrived on Earth in ancient meteorites after the planet had already formed.
Sometime in the distant future, the Earth once again will have a massive supercontinent, and today's beachfront real estate will be a lot less desirable.
Telltale signs of life have been discovered in rocks that were once 12 miles (20 kilometers) below the surface — some of the deepest chemical evidence for life ever found.
Four-billion-year-old sample suggests modern-day Iceland is our best bet for an example of how Earth's continents first formed.
The story of how life changed the face of the Earth may be more profound than previously envisioned and could lead to new clues for detecting life on exoplanets.
A new hypothesis gives the moon credit for cooling a hot, early Earth to the temperatures necessary for life to evolve.
One geologist thinks Earth has been banged up a bit more than previously thought -- never allowing the 'Snowball Earth' global ice age to develop.
Oxygen may have filled Earth's atmosphere hundreds of millions of years earlier than previously thought.
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