| 11. | From the Andes to the Alps, mountain glaciers are retreating.
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| 12. | The Yangtze River is derived from the mountain glacier.
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| 13. | Mountain glaciers, he noted, are a key water source in some regions, particularly in summer.
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| 14. | Mountain glaciers in otherwise unglaciated areas extend to lower elevations due to a lower snow line.
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| 15. | Antarctic mountain glaciers contribute 28 % of this.
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| 16. | The drainage of supraglacial lakes on mountain glaciers can disrupt the internal plumbing structure of the glacier.
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| 17. | Glaciologists have documented large-scale shrinkage of mountain glaciers throughout North and South America, Europe, Asia and Africa.
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| 18. | However, geomorphological evidence in the form of moraines and cirques indicates the former presence of mountain glaciers.
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| 19. | Mountain glaciers have receded in many areas.
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| 20. | Increasing temperatures cause mountain glaciers to melt.
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