http://www.sciencedaily.com/releases/2012/02/120226153643.htm is it possible that the core is nuclear?
Clue to super volcanic eruption... Scientists see volcanic eruption 'trigger' Oct. 12 (UPI) -- British scientists say they have identified a repeating underground trigger for the largest explosive volcanic eruptions on Earth.
Mexico Raises Alert Level For Popocatepetl Volcano... Mexico readies shelters after volcano tremors increase, steam plume spews into sky May 12, 2013 Seismic activity has increased at the Popocatepetl volcano near Mexico City, leading authorities to alert towns in two central states and the capital.