glaciation

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There's still plenty of mystery surrounding snowball Earth—aka the Sturtian glaciation—Macdonald said.
Francis Macdonald提到，對於“雪球地球”仍然有許多不解之処--正如我們所知的圖特冰川作用。
These changes alter the intensity of sunlight hitting the Earth at high latitudes, and so affect the extent of glaciation.
這些變化改變了高緯度區域的日照強度，由此影響了冰河作用的範圍。
Besides the Bow Valley, evidence of glaciation also appears in this image south of the lake, in the amphitheater-shaped cirque.
除了被迷你汪卡湖佔據的弓河穀外，冰川作用的証據還可以在南部的圓形冰鬭処找到。

Several scientists pointed out that during most of the past 10, 000 years, the time period since the last full-blown ice age glaciation ended, global temperatures were warmer than today.
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Melott says that although the Northern hemisphere would have been left untouched by the first pulse of the extinction, he notes that, later, glaciation and sea level change would have had an impact everywhere.
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Subsequent analysis showed that the lake was 50km wide, 225km long, 500 metres deep, and at least 2m years old—though new data presented to the workshop suggest that its age may be closer to 15m years, and that it could even predate the glaciation of Antarctica, which occurred around 40m years ago.
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In geology, glaciation is the process by which the land is covered by glaciers. Glaciations are periods when this happens.