Discussion
Match each orbital cycle with its approximate period.
List I
A. Eccentricity
B. Obliquity
C. Precession
D. Glacial cycles of the last million years
List II
1. about twenty-three thousand years
2. about a hundred thousand years
3. about a hundred thousand years
4. about forty-one thousand years
Answer: C
The periods appear clearly in the isotope records, which is the strongest evidence for the orbital theory. The dominance of the hundred thousand year period is nonetheless still debated. The periods appear in the records.
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