A team of researchers at the University of Northern Iowa (UNI) is exploring some of the deepest caves in the country to learn ...

Inland blue holes, however ... of iron in the stalagmites and red stripes visible in the sediment of cave walls. Information from speleothems will shed light on today's rapid warming and the ...

Most people think of visiting big cities, national parks, and beaches when they plan a U.S. trip. There’s hardly anyone who’s ...

Astrobiologist Joshua Sebree of the University of Northern Iowa suggests that South Dakota's Wind Cave exhibits chemical similarities to Jupiter’s icy moon Europa.

Deep below Earth's surface, rock and mineral formations lay hidden with a secret brilliance. Under a black light, the ...

The Marble Caves are natural rock formations with curved walls covered in swirling mineral ... which fill the caves with blue light and give them an ethereal appearance. The Marble Caves are ...