Which of the following factors contribute to the periodic changes in Earth's temperature known as the Milankovitch cycles? SELECT THREE CORRECT ANSWERS
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A. Earth's atmosphere has been enriched in oxygen by cyanobacteria
B. Earth's orbit alternates between a circular and an elliptical shape
C. Earth's shape is spherical
D. The concentration of carbon dioxide in Earth's atmosphere is decreasing
E. Earth wobbles slightly on its axis
F. Earth's axial tilt varies between 22 and 24 degrees
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Answer:
A, B and C are the correct answers
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