Launched in 2009, the LRO was conceived to create a 3D map of the moon ... Studying the moon’s underground caves could give researchers a better understanding of how volcanism works, per ...

The umbrella leaks at places called sinkholes, from which surface water makes its way underground, eroding the limestone into a honeycomb of caverns. Mammoth, the world's longest known cave system ...

Carlsbad Caverns is home to some of the most spectacular examples of underground geologic features found anywhere in the United States. Located in southeastern New Mexico, the park contains more than ...