Multiple Choice
Long-period variations in surface temperature on Earth are caused by a variety of factors. Which one of the following is not one of these factors?
A) variation in the brightness of the Sun
B) changes to the eccentricity of Earth's orbit
C) changes to the angle and orientation of Earth's rotation axis
D) variability of radioactive decay of elements within Earth
Correct Answer:

Verified
Correct Answer:
Verified
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