High carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.

高二氧化碳含量与温暖的间冰期有关，低二氧化碳含量与寒冷的冰期有关。

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When snowfalls on high mountains or in polar regions, it may become part of the glacial system.

当雪落在高山或极地地区时，它可能成为冰川系统的一部分。

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Recent studies do in fact show that high carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.

最近的研究确实表明，高二氧化碳水平与温暖的间冰期有关，而低二氧化碳水平与寒冷的冰期有关。

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Just 20 miles due west of the city is a 10-foot-high glacial moraine that separates the Mississippi and its vast north-south system of tributaries from the Great Lake waterways.

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Paragliding is another popular way to enjoy the mountains, as the glacial peaks offer high altitude jumping off points with strong winds, giving pilots plenty of air time to enjoy the view of patchwork valleys below.

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