... 火山喷发碎屑 tephra 火山喷发规模 scale of volcanic eruption 地震以及火山喷发 Earthquakes Or Volcanic Eruptions ...
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一些地质学家估计，胡德火山在过去的15,000年里经历过大规模的喷发活动。
Geologists estimate, however, that Mt. Hood has experienced bursts of eruptive activity in the past 15, 000 years.
科学家们猜测这些巨大灾难的原因要么是来自天上致命的小行星或彗星；要么是来自地上超大规模的火山喷发。
The main suspects behind these catastrophes seem to come either from above, in the form of deadly asteroids or comets, or from below, in the form of extraordinarily massive volcanism.
至于气温突降的原因，最具代表性的观点认为是由于天体冲撞或大规模火山喷发激起的火山灰和尘土。
As to what caused these cold snaps, the ever-popular suspects are ash and dust kicked up by either astronomical impacts or massive volcanism.
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