超级火山,人类灭绝的最大威胁?
<p><span word="A">A</span> <span word="Giant">Giant</span> <span word="Volcano">Volcano</span> <span word="Could">Could</span> <span word="End">End</span> <span word="Human">Human</span> <span word="Life">Life</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="as">as</span> <span word="We">We</span> <span word="Know">Know</span> <span word="It">It</span></p><p>超级火山，人类灭绝的最大威胁？</p><p><span word="If">If</span> <span word="you">you</span>'<span word="re">re</span> <span word="planning">planning</span> <span word="to">to</span> <span word="visit">visit</span> <span word="Yellowstone">Yellowstone</span> <span word="National">National</span> <span word="Park">Park</span> <span word="this">this</span> <span word="Labor">Labor</span> <span word="Day">Day</span> <span word="weekend">weekend</span>, <span word="I">I</span> <span word="have">have</span> <span word="good">good</span> <span word="news">news</span>: <span word="It">It</span> <span word="is">is</span> <span word="very">very</span>, <span word="very">very</span>, <span word="very">very</span> <span word="unlikely">unlikely</span> <span word="that">that</span> <span word="the">the</span> <span word="supervolcano">supervolcano</span> <span word="beneath">beneath</span> <span word="it">it</span> <span word="will">will</span> <span word="erupt">erupt</span> <span word="while">while</span> <span word="you">you</span>'<span word="re">re</span> <span word="there">there</span>.</p><p>如果你打算在这个劳动节周末去黄石国家公园，我有个好消息：你在公园期间，公园下面的超级火山喷发的可能性非常非常小。</p><p><span word="The">The</span> <span word="Yellowstone">Yellowstone</span> <span word="supervolcano">supervolcano</span> — <span word="an">an</span> 8 <span word="out">out</span> <span word="of">of</span> 8 <span word="on">on</span> <span word="the">the</span> <span word="Volcanic">Volcanic</span> <span word="Explosivity">Explosivity</span> <span word="Index">Index</span> — <span word="has">has</span> <span word="erupted">erupted</span> <span word="three">three</span> <span word="times">times</span> <span word="over">over</span> <span word="the">the</span> <span word="past">past</span> 2.1 <span word="million">million</span> <span word="years">years</span>, <span word="most">most</span> <span word="recently">recently</span> 640,000 <span word="years">years</span> <span word="ago">ago</span>. <span word="A">A</span> <span word="Yellowstone">Yellowstone</span> <span word="eruption">eruption</span> <span word="would">would</span> <span word="be">be</span> <span word="like">like</span> <span word="nothing">nothing</span> <span word="humanity">humanity</span> <span word="has">has</span> <span word="ever">ever</span> <span word="experienced">experienced</span>.</p><p>黄石超级火山在过去210万年里喷发过三次，最近一次是在64万年前。人类历史上还没有经历过黄石火山喷发。</p>
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