explanation
Sometimes both heaven "and" Earth erupt. In Iceland [ http://www.cia.gov/cia/publications/factbook/geos/ic.html ] in 1991, the volcano Hekla [ http://www.south.is/hekla.html ] erupted at the same time that auroras [ http://www.exploratorium.edu/learning_studio/auroras/ ] were visible [ http://www.iww.is/art/shs/ ] overhead. Hekla [ http://www.norvol.hi.is/hekla.html ], one of the most famous volcanoes [ http://www.crystalinks.com/volcanoesactive.html ] in the world, has erupted [ http://www.volcanolive.com/faq.html ] at least 20 times over the past millennium, sometimes causing great destruction [ http://www.each-mara.net/volcano/santorini.pdf ]. The last eruption [ http://www.norvol.hi.is/heklaeruption.html ] occurred only two years ago but caused only minor damage. The green auroral band [ http://antwrp.gsfc.nasa.gov/apod/ap010402.html ] occurred fortuitously [ http://www.nationalgeographic.com/ngm/100best/wallpaper09.html ] about 100 kilometers above the erupting lava [ http://volcano.und.nodak.edu/vwdocs/frequent_questions/group1_new.html ]. Is Earth [ http://volcano.und.nodak.edu/vw.html ] the Solar System's only planet with both auroras [ http://www.physicsweb.org/article/news/5/1/10 ] and volcanos [ http://www.thursdaysclassroom.com/index_07oct99.html ]?
Explanation
false