| 21. | Sea ice extent is defined as the area with at least 15 % ice cover.
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| 22. | There's also been very little ice cover on the Great Lakes, resulting in increased evaporation.
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| 23. | Referring to a moon of Jupiter, McKay said, " Europa has a big ice cover.
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| 24. | Currently, an ice cover exists from April to September; it can reach a thickness of.
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| 25. | This spring his institute will publish a striking catalogue of the world's shrinking ice cover.
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| 26. | The map of Greenland depicted 15 % less ice cover than in the 1999 edition.
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| 27. | The water temperature varies between and and the ice cover on the lake is thick.
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| 28. | Previous studies had suggested that the year-round ice cover would last 300 years or so.
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| 29. | Of the ice cover still present in 2000, almost 40 percent had disappeared by 2011.
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| 30. | The last advance of the ice cover was more limited, affecting only the eastern Burren.
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