the sixth highest mountain
... that the sixth highest mountain in South America is a volcano last active 28,000 years ago that might erupt again?
... that <b id="mwAVI"><a href="./Nevado_Tres_Cruces" id="mwAVM" rel="mw:WikiLink" title="Nevado Tres Cruces">the sixth highest mountain</a></b> <i id="mwAVQ">(pictured)</i> in South America is a volcano last active 28,000 years ago that might erupt again?