Kumani Bank mud volcano has produced transient islands multiple times since its first recorded eruption in 1861.

A mysterious island suddenly emerged on the surface of the Caspian Sea, only to disappear again in less than two years.

The active Sakurajima stratovolcano in Kagoshima, Japan, erupted on Sunday, sending a huge plume of ash into the sky.

A stunning composite image, made up of three years' worth of satellite photos, shows the ancient lava of Libya's Haruj ...