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| Scales of lake-level change in the past. A, In the last 12,000 years, the lake has experienced dramatic change due to changing outlets and isostatic tilting. B, For the past 5,000 years, climatically-controlled fluctuations have been superimposed on a general falling trend. C, For the last 160 years, lake level has fluctuated, but each peak of this century has been higher than the last. |
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