See a supercell light up the Texas sky, U.S. Marines braving a sandstorm in Afghanistan, the Olympic torch reach the top of Mount Everest, and more.

Tens of thousands of animals are trapped in an ash-covered region of southern Chile after their owners have been forced to flee the still-active volcano.

See how Cyclone Nargis changed the landscape of the Irrawaddy River delta, where massive floods killed tens of thousands.

Among the unusual finds are a possible victim of human sacrifice and a skeleton with curiously curved bones, anthropologists report.

Troops forced out the last holdouts after glowing rocks spewed from Chaitén. An expert warns that a catastrophic flow of toxic gas and ash could follow.

People living in the earliest known settlement in the Americas relied partly on seaweed, bolstering the theory that the New World was settled via a coastal route, a new study says.

A "perfect storm" of factors—from location to wind speed to poor preparation—have resulted in perhaps a hundred thousand deaths from Cyclone Nargis.

Thousands of horses, cows, and other livestock face a toxic brew of deep ash and gases. And the region's all-important farms may be devastated for decades.

The grassy prehistoric Sahara turned to desert more slowly than previously thought, a new report says—and some say global warming may turn the desert green once again.

The world's largest group of orangutans in Indonesia may face extinction by 2011 because of palm oil plantation expansion, which is destroying habitat, experts say.

Great tits are timing their egg laying to coincide with an earlier emergence of caterpillars in England, a decades-long study has found.