As it pours down the volcano, the lava at the surface is ... The gooey appearance of a rock wall in Manu Nui cave was formed when the lava chemistry started to change and the iron contained ...

Cueva de los Verdes and Jameos del Agua located inside the volcanic tunnel, are natural caves that are open to visitors and natural caves that were formed following the eruption of the Corona Volcano.

The caves form as heat rises from the volcano’s depths and melts the base of the ice cap that fills Rainier’s twin craters. (See diagram below.) More than 5,000 climbers trudge across those craters ...

Cueva de los Verdes and Jameos del Agua located inside the volcanic tunnel, are natural caves that are open to visitors and natural caves that were formed following the eruption of the Corona Volcano.

Just north of the Deschutes County Fairgrounds, the Redmond Caves, a series of five caves administered by the Bureau of Land ...