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Discussion

Milankovitch cycles are variations in

  • A.the circulation of the ocean
  • B.the Earth's orbit and axial tilt
  • C.the total radiative output of the Sun
  • D.the level of volcanic activity

Answer: B

Eccentricity, obliquity and precession together modulate the seasonal distribution of sunlight. They pace the ice ages rather than changing the total energy the Earth receives appreciably. Three separate cycles are involved.

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