By contrast, lava caves, widely known as lava tubes ... Most of Hawaii’s lava tubes are formed by a type of syrupy flow called pahoehoe. As it pours down the volcano, the lava at the surface ...

The two are linked as some of the best caves are, in fact, a lava tube, which is a natural tunnel formed by flowing lava moving underneath the hardened surface of a lava flow. Tubes act as a ...

Walking into Fingal's Cave is like walking into the heart of the Earth. Here among the towering basalt columns, the visitor stands inside a lava flow. Magma that swelled up from deep in the Earth ...

Approximately 700,000 years ago when molten rock erupted from a vent in nearby Hart Prairie, the mile-long Lava River Cave was formed. Today, visitors can explore the cave's cool, dark expanse by ...

I’ve been asked by my fellow explorers to get some rock samples from Mount Vesuvius, but it’s an active volcano, so I’ll need to watch out for things like lava flow. Lava is very hot molten ...