Farm buildings and green fields with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

Landscape covered in volcanic ash and dust with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions

Billowing ash plume of the Eyjafjallajokull eruption, southern area, Iceland, Polar Regions

Eyjafjallajokull eruption showing billowing ash plume and rocks exploding into the sky of southern Iceland, Iceland, Polar Regions

Distant view towards mountains with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

October 19, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash and steam cloud are blown away by wind. View over industrial area of Kliuchi town with Kamchatka River in foreground.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano.

October 15, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

October 24, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia, seen in evening light. Ash cloud is produced by the activity. Kamen volcano is seen on right.

October 21, 2013 - Nighttime view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

October 16, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.

October 21, 2013 - Nighttime moonlit view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

February 24, 2013 - Mushroom shaped ash cloud produced by powerful explosive eruption of Sakurajima volcano, Kagoshima, Japan.

February 24, 2013 - Ash cloud rising following eruption of Sakurajima volcano, Japan

February 24, 2013 - Powerful explosive eruption of Sakurajima volcano, Japan. Ash cloud rises against blue sky.

November 30, 2012 - Glowing Rerombola lava dome of Paluweh (or Rokatenda) volcano during eruption in 2012, Flores, Indonesia.

November 30, 2012 - Glowing Rerombola lava dome with incandescent rockfall deposit, Paluweh volcano, Flores, Indonesia.

January 24, 2012 - Lava in crater glowing during blue hour on Nyamuragira Volcano, Kimanura Eruption.

January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.

December 12, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

December 11, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.

Headland with lighthouse at Dyrholaey looking towards a black volcanic sand beach stretching 15 miles into the distance and the ash plume of the Eyjafjallajokull eruption, near Vik i Myrdal, southern area, Iceland, Polar Regions

Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions

Distant view of the Seljalandsfoss waterfall with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern Iceland, Iceland, Polar Regions

Houses at foot of mountains with the ash plume of the Eyjafjallajokull eruption in the distance, southern area, Iceland, Polar Regions

Cloud of ash from Eyjafjallajoekull volcano and a steam plume from the lava flow in Gigjoekull glacier tongue, Iceland, Europe

Ash cloud of the Eyjafjallajoekull volcano, steam plume from the lava flow in Gigjoekull glacier tongue, and exit point of the previous flood, Gigjoekull, Iceland, Europe