Mount Sinabung spews pyroclastic gas and ash, seen from Tiga Pancur village on October 13, 2014 in Berastagi, Karo district, North Sumatra, Indonesia. Mount Sinabung, which has lain dormant for over 400 years, has been intermittently erupting since September 15 last year, killing dozens and forcing thousands to flee their homes. #

Lava explodes from the Pico do Fogo volcano next to the village of Portela on Fogo Island, Cape Verde, on November 28, 2014. Molten lava from the volcano in the Cape Verde archipelago slid towards the town of Cha das Caldeiras on Thursday, threatening to destroy it and a nearby village four days after an initial eruption. #

A giant cloud of ash and steam rise from erupting Sangeang Api volcano seen from Bima town on Sumbawa island, Indonesia, on May 30, 2014. Flights into and out of the northern Australian city of Darwin were cancelled May 31, and some to Bali affected, after huge ash clouds were thrown up by the volcano. #

Steam and ash rise from the Bardarbunga volcano in southeast Iceland on September 14, 2014. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 meters (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. #

Smoke rises from the lava eruption on Holuhraun, northwest of the Dyngjujoekull glacier in Iceland, on September 1, 2014. Lava fountains danced along a lengthy volcanic fissure near Iceland's subglacial Bardarbunga volcano, prompting authorities to raise the aviation warning code to the highest level and close the surrounding airspace. #

Volcanic ash covers a plane and the airport of Solo in Central Java about 150 kilometers (93 miles) west of Mount Kelud volcano on February 14, 2014. Several people were been crushed to death after a volcanic eruption blanketed rooftops with rocks and ash, causing homes to cave in, an official said on February 14. #

The Tungurahua volcano throws ash and stones during an eruption seen from Banos, Ecuador, on August 31, 2014. The volcano entered an eruptive phase in 1999 and continues to this day. #

In this April 4, 2014 photo, the Tungurahua volcano spews a column of ash as seen from Ambato, Ecuador. The volcano spewed a miles high column of ash after a powerful explosion that shot pyroclastic material onto its northern and northwestern flanks. #

Lava from the Stromboli volcano flows into the sea, on August 9, 2014. Stromboli, one of Europe's most active volcanoes, is part of the seven-island Eolian Archipelago just off Sicily in southern Italy. #

This photo taken on March 22, 2014 shows the blue flame of burning sulfur at the crater of the Kawah Ijen volcano in Banyuwangi regency, East Java province. The natural phenomenon which can be seen at night is caused by sulfuric gases from the volcano which can ignite into blue flames. #

This Photo taken on February 1, 2014 shows a miner carrying blocks of sulfur from Ijen crater in Banyuwangi East Java. A miner can weigh from 45 to 90kg and might make as many as two or three trips in a day. The sulfur is then used for vulcanizing rubber, bleaching sugar and other industrial processes. #

A plume of smoke from Alaska's Pavlof volcano on the lower Alaska peninsula is pictured in this November 15, 2014 NASA satellite image. By November 15, Pavlof was lofting ash plumes to an altitude of 30,000 feet (9 kilometers), high enough to disrupt commercial airline flights. #

A picture taken on June 21, 2014 shows lava flowing out of the Piton de la Fournaise volcano, one of the world's most active volcanoes, located on the French island of Reunion in the Indian Ocean. The Piton de la Fournaise started to erupt early on June 21. #

A long exposure photograph taken late on October 9, 2014 shows scorching lava flow and giant ash clouds released from the crater during the eruption of Mount Sinabung volcano as seen from Karo district of Sumatra island. #

A photographer runs as Mount Sinabung erupts with ash clouds, as seen from Karo District on Sumatra island on October 25, 2014. Super-heated ash clouds reaching two kilometers into the air spewed from the crater of Mount Sinabung volcano threatening villages during its recent series of eruptions. #

This long exposure photograph taken before dawn on October 14, 2014 shows sparks of lightning, scorching lava flow and giant ash clouds released from the crater during the eruption of Mount Sinabung on Sumatra island. #

Nine months after a new island broke through the surface of the western Pacific Ocean, the volcanic eruption at Nishino-shima continues. The tiny new volcanic island ("Niijima" in Japanese) merged into Nishino-shima last winter and continued to grow. Steady flows of lava are enlarging the merged island, which is now 1.39 square kilometers (0.54 square miles). The Operational Land Imager on Landsat 8 captured this image of Nishino-shima on August 21, 2014. #

Lava flows from Mount Etna on the southern Italian island of Sicily near Catania on August 14, 2014. Mount Etna is one of the most active volcanoes in the world and is in an almost constant state of activity. #

Steam and volcanic gases rise from Mount Ontake on September 27, 2014. The volcano, a a popular tourist attraction, erupted suddenly on September 27, catching several hundred climbers offguard. 57 people were killed, buried beneath the ash. #

In this September 1, 2014 photo, fluid lava streams from the June 27 lava flow from the Kilauea volcano in Pahoa, Hawaii. The June 27 lava flow is named for the date it began erupting from a new vent. The Hawaiian Volcano Observatory issued warnings to Pahoa, in the path of a lava flow on Hawaii's Big Island, as the molten rock moved to within a mile of homes. Kilauea has been erupting continuously for more than 31 years. #

A melted enclosure containing a time lapse camera that USGS Hawaii Volcano Observatory scientists were using to monitor a lava tube skylight near the town of Pahoa on the Big Island of Hawaii on November 7, 2014. The camera was caught in an overflow of lava surrounding the tripod that melted the power cable and the camera's container. Hawaii County civil defense officials said in a statement Saturday the lava's front remains about 480 feet from Pahoa Village Road. This position hasn't changed since October 30. But lava is creeping out at several spots upslope of the leading edge. #

Turrialba volcano, located in the Costa Rican province of Cartago, about 35km southwest of San Jose, spews ash on November 1, 2014. The eruption was the largest in the last 150 years, according to the National University of Costa Rica. #