Fumarole from Mount Gede, Indonesia

Fumarole from Mount Gede, Indonesia

This opening on the side of Mount Gede in West Java, Indonesia, is known as a fumarole. Fumaroles like this typically emit steam and sulfurous gases from within the crust of the earth, forming the yellowish deposit around its rim.

Sulphur deposit around fumarole at Mount Gede

Credits: 

Fidel Costa