These sediments become compacted to form a new type of rock called sedimentary ... by water flowing through the rock and then slowly dissolving away. Like most caves in the world, the Marble ...

Located in the southern Black Hills of South Dakota, the Wind Cave is ... in the rocks over millions of years, essentially “chemistry fossils.” These colors reveal the types and amounts ...

Fluorescent cave minerals are helping scientists explore how life could survive in harsh places like Europa. Far beneath Earth’s surface, rock and mineral formations conceal a hidden brilliance. When ...