人们所热衷的假设包括小行星碰撞，西伯利亚大规模的火山爆发以及海洋毒化等现象。
Favorite hypotheses include an asteroid impact, massive volcanic eruptions in Siberia, and toxic oceans.
很多自然因素改变着地球的地表形态和地质构造，如地震、火山、飓风、雨水等。
Lots of natural factors change the face &structure of the earth like earthquakes, volcanoes, hurricans, rain etc. Such changes give birth to new lands, rivers mountains , rocks &stones.
注意到如皮纳图和喀拉喀托等大型火山爆发后是小幅度但很显著的气温下降。
Note that large volcanoes, like Pinatubo and Krakatoa, were followed by a fractional — but significant — drop in temperature.
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