这是对地球有具大影响的几个时期 glacial age冰川时代 ;冰河期 ice age冰河时代 glacial period冰河时期 我等着你采纳哟,不明还可以追问的,嘻嘻!
cause an ice age to begin and end. The current ice age we're in is not the first the Earth has experienced.At least five major ice ages have occurred throughout Earth's history.(1)What is the main...
people began to talk about ice ages. It was also apparent that the glaciation occurred in the relatively recent past because the drift was soft, like freshly deposited sediment. We now know the age of the glaciation accurately from radiometric dating of the carbon-14 in logs buried in the dr...
根据最后一段The current ice age we're in is not the first the Earth has experienced.At least five major ice ages have occurred throughout Earth's history.我们现在所处的冰河时代并不是地球第一次经历。地球历史上至少发生过五次大冰期。可推知,在缺失的第五段中,作者最有可能写的是关于地球历史上...
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The Ice Age was a long period of time in which four great glaciers pushed southward to cover almost all the upper half of North America, and then melted away. Each glacier was a thick sheet of ice and snow that spread out from a centre near what is now Hudson Bay in Canada. The ...
ice extended to or very near the equator. It has been suggested that the end of this ice age was responsible for the subsequent Cambrian Explosion, though this theory is recent and controversial. A minor ice age occurred from 460 to 430 million years ago, during the Late Ordovician Period....
The Ice Age was a long period of time in which four great glaciers (冰川) pushed southward to cover almost all the upper half of North America, and then melted away. Each glacier was a thick sheet of ice and snow that spread out from a center near what is now Hudson Bay in Canada...
根据第一段An Ice age is a period of time, typically about 30 million but occassionally as long as 300 million years, during ehichice sheets cover at least the Earth's polar areas.(冰河期是一段,通常约为3000万年,但有时长达3亿年的时间,在此期间,冰盖至少覆盖了地球的极地地区。)可知,作者是...
根据第一段第一句“An Ice Age is a period of time, typically about 30 million but occasionally as long as 300 million years, during which ice sheets cover at least the earth's polar areas.(冰河期是一段时期,通常约为3000万年,但有时长达3亿年,在此期间,冰原至少覆盖了地球的极地地区)”可知,...