basalt
... that more than 90 percent of all volcanic rock on Earth is basalt ?
... that more than 90 percent of all <a href="./Volcanic_rock" id="mwBKY" rel="mw:WikiLink" title="Volcanic rock">volcanic rock</a> on Earth is <b id="mwBKc"><a href="./Basalt" id="mwBKg" rel="mw:WikiLink" title="Basalt">basalt</a></b> <i id="mwBKk">(example pictured)</i><span about="#mwt67" data-mw='{"parts":[{"template":{"target":{"wt":"-?","href":"./Template:-%3F"},"params":{},"i":0}}]}' id="mwBKo" style="padding-left:0.15em;" typeof="mw:Transclusion"><span typeof="mw:Entity">?</span></span>