<http://schema.org/description>
"Some of Mars' deep craters were actually ancient supervolcanoes that may have changed the planet's climate, U.S. and British researchers suggest."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2013/10/02/Suggestion-of-supervolcanoes-on-Mars-ignites-controversy/UPI-16381380746866/>