Iceland has closed its main international airport and cancelled domestic flights after its most active volcano, Grimsvotn, began erupting. A plume of smoke has risen 20km (12 miles) into the sky from the volcano. But Iceland’s Meteorological Office says the eruption should not cause widespread disruption to air traffic. Last year, ash clouds from another Icelandic volcano, Eyjafjallajokul, led... 

The volcanic plume of partly molten rock that feeds the Yellowstone supervolcano. Yellow and red indicate higher conductivity, green and blue indicate lower conductivity. Made by University of Utah geophysicists and computer scientists, this is the first large-scale 'geoelectric' image of the Yellowstone hotspot. The gigantic underground plume of partly molten rock that feeds the Yellowstone... 

A NASA image of an erupting solar flare. A powerful solar eruption that has already disturbed radio communications in China could disrupt electrical power grids and satellites used on Earth in the next days. A powerful solar eruption that has already disturbed radio communications in China could disrupt electrical power grids and satellites used on Earth in the next days, NASA said. The massive sunspot,... 

The Campi Flegrei caldera is a supervolcano. While a new eruption here would be more likely to result in the creation of another Vesuvius-like cone, the worst-case scenario could see it obliterating much of life in Europe. Two thousand years ago Mount Vesuvius destroyed Pompeii. Today, a larger, far more deadly supervolcano lurks on the other side of Naples. If it erupts, Campi Flegrei could wipe out...