Earth may have had fresh, not just salty, water as soon as 600 million years after the planet formed — a mere blink of an eye in geologic time. Researchers analyzed oxygen molecules within ...

(via SciShow) So we all know about the carbon cycle, and the water cycle, and maybe even the nitrogen cycle. But new research has figured out there's a salt cycle, too. Problem is, that same research ...

Early Earth got much of its water from relentless bombardment by water-rich asteroids and icy comets. Now, scientists say the young planet had a way to hold onto much more of that water than once ...