The Sumerians lived in Mesopotamia from about 4500 to 1750 B.C.E., and developed a number of technologies that changed the ...

A team of planetary scientists, ecologists, and marine biologists affiliated with several institutions in the U.S. and one in ...

Long before the Great Lakes came to define the heart of North America, a much larger lake once ruled the land. Lake Agassiz, a prehistoric inland sea, spread across the continent with a reach that ...

Planetary boundaries outline how far past pre-industrial conditions Earth can get before anthropogenic activity has ...

The Silurian Hypothesis asks whether signs of truly ancient past civilizations would even be recognisable today.

"The expanding-Earth theory had the merit of explaining with a fixist model the evidence of ancient continental connections," ...

The spacecraft, which snatched a dusty, pebbly sample in October 2020, is currently on its way back to Earth to drop off the precious material. But before it grabbed its sample, OSIRIS-REx spent ...

Researchers have found that ocean acidification entered a "danger zone" in 2020, suggesting increased carbon dioxide levels have caused Earth to breach another planetary boundary.

The Earth has had at least five major ice ages, and humans showed up in time for the most recent one. In fact, we’re still in ...

It is another decade (late 1990s) before the terrain east of Spirit Lake is considerably greener. By the end of the series, the only area (beyond the slopes of the mountain itself) that remains ...