

-_.i ..tf^sSa--, 



:if'i 



> 





Figure 25. — At top, the Earth's changing orbit over a 100,000- year period. Ice sheet withdraws when orbit is eccentric, 

 returns when it is circular. (Reprinted with permission of the "New York Times".) 



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Brunner, C. A., and J. F. Cooley. 1976. Circulation in the 

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Burckle, L., and D. Stanton. 1975. Distribution of displaced 

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42 



