During glaciations, the lighter oxygen-16 has a greater tendency to evaporate from the ocean surface than the heavier oxygen-18 does.
在冰川期，较轻的氧-16比较重的氧-18更容易从海洋表面蒸发。
If the Earth-Sun distance were as little as 1 percent larger, runaway glaciations on Earth about 2 billion years ago would have caused the oceans to freeze and remain frozen to this day.
如果地球与太阳的距离再大1%，大约20亿年前地球上失控的冰期就会导致海洋冻结，并一直冻结到今天。
By the early part of the twentieth century, scientists believed that four distinct glaciations had affected North America and Europe during the Pleistocene epoch.
到二十世纪初，科学家们认为，在更新世期间，有四次不同的冰川作用对北美和欧洲产生了影响。
This contradicts previous ideas which suggest the impact of the asteroid actually precipitated a period of glaciations, Gostin says.
这与早先认为的小行星的撞击实际上加速了结冰期的来临这一说法相矛盾。
He explained that one represents a lineage that was pushed south during the last glaciations and survived in what is now the United States.
他解释称其中一支是在上一次冰河时代被迫南迁至现在的美国并存活下来的。
These ice ages are also called glaciations and the periods of relative warmth between them are called interglacials .
这些冰期也叫冰河期，在各冰期间的相对温暖时期就叫间冰期。
Global glaciations took place in the earth in Neoproterozoic, which are called the "Snowball earth" event by some scholars.
在新元古代晚期地球上曾发生过全球性的冰川作用，一些学者称之为“雪球”事件。
A series of glaciations further modified the region starting about 2 to 3 million years ago and ending sometime around 10,000 BP.
约2至3百万年前开始并于距今约一万年前结束的一系列冰川进一步改造了这个地区。
A series of glaciations further modified the region starting about 2 to 3 million years ago and ending sometime around 10,000 BP.
约2至3百万年前开始并于距今约一万年前结束的一系列冰川进一步改造了这个地区。
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