超级喷发
![超级喷发](../cache/1344623.jpg)
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仅有的全球范围的剧烈变动,不过是由大的陨石撞击或超级火山喷发所引起。
The only abrupt worldwide change would have been major asteroid impacts or volcanic super-eruptions .
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古代东加尼福利亚这场超级火山喷发形成了长谷火山口--约20英里长,11英里宽。
The ancient super-eruption in eastern California formed the Long Valley Caldera - a feature that is nearly 20 miles long and 11 miles wide .
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通过对加利福尼亚主教凝灰岩(76万年前此地曾发生过一场超级火山喷发)浮石中的石英晶体进行显微分析,研究者们确定了这一结论。
Researchers have determined this based on a microscopic analysis of quartz crystals in pumice from the Bishop Tuff in California , the site of a super-eruption 760000 years ago .
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如果超级火山喷发即将发生,那么该爆炸将喷射出足够多的火山灰到大气之中,从而扰乱接下来多年的天气,有可能会造成饥荒、健康危机和全球动乱。
If a super-eruption were to occur , the blast would launch enough ash into the atmosphere to disrupt weather for years to follow , potentially causing famine , health crisis , and global civil unrest .