Eruption and lava flow from the Monti Calcarazzi fissure on the southern flank of Mt Etna in 2001, This flow threatened the town of Nicolosi, Sicily, Italy

Lava flowing down mountain from Eyjafjallajokull volcano, Iceland, Polar Regions

Lava flowing down mountain from Eyjafjallajokull volcano, Iceland, Polar Regions

Fountaining lava from Eyjafjallajokull volcano, Iceland, Polar Regions

Lava flowing down mountain, Eyjafjallajokull volcano, Iceland, Polar Regions

Fountaining lava from Eyjafjallajokull volcano, Iceland, Polar Regions

Lava erupting from Eyjafjallajokull volcano, Iceland, Polar Regions

Looking into the cinder cone of erupting Eyjafjallajokull volcano, Iceland, Polar Regions

Lava erupting from cinder cone, Eyjafjallajokull volcano, Iceland, Polar Regions

Lava flowing down mountain, Eyjafjallajokull volcano, Iceland, Polar Regions

Vulcanologist at work, La Fournaise volcano, island of Reunion, Africa

Lava flowing into the Pacific Ocean, Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, Pacific

Lava flowing into the Pacific Ocean, Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, Pacific

Lava flowing into the Pacific Ocean, Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, Pacific

Lava flowing into the Pacific Ocean, Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, Pacific