In the future, a spacecraft with a higher-resolution radar could even map the interior of all the pits ... Bruzzone and his co-authors also noted that caves and lava tubes of different ages ...

The Canary Islands not only boast the third largest volcano in the world, but also the largest natural underwater lava ... small interior lakes, and a blend of dry and submerged cave sections.

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 ...