The Piton de la Fournaise volcano on the French island of la Reunion

Aerial view of a chopper flying over lava streams flowing out of the Piton de la Fournaise volcano on the French island of la Reunion in the Indian ocean.

Thick smoke spews from the summit of Mount Sinabung as it erupts in Indonesia

Thick smoke spews from the summit of Mount Sinabung as it erupts in Indonesia

Thick smoke and ash spew from the summit of Mount Sinabung

Thick smoke and ash spew from the summit of Mount Sinabung, as seen from Tanah Karo in Sumatra

The eruption of Mount Sinabung

An Indonesian woman carrying a child observes the eruption of Mount Sinabung 

Mount Sinabung volcano spews smoke in Suka Nalu village

An aerial view shows Mount Sinabung volcano spewing smoke

Congolese soldier at the Virunga national park looks into a boiling lava lake in the crater of the Nyiragongo volcano

A Congolese soldier at the Virunga national park looks into a boiling lava lake in the crater of the Nyiragongo volcano

Mount Sinabung spews volcanic materials into the sky in Karo

Mount Sinabung spews volcanic materials into the sky in Karo, North Sumatra, Indonesia

The most active of Vanuatu's nine volcanoes - roars to life on Tanna island

The most active of Vanuatu's nine volcanoes - roars to life on Tanna island