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?

Question

Quizplus · Accepted Answer

Variability of radioactive decay of elements within Earth does not have a significant effect on long-period variations in surface temperature on Earth. The other three options all play important roles in causing variations in Earth's climate over long periods of time. Variation in the brightness of the sun affects the amount of solar energy that reaches Earth. Changes to the eccentricity of Earth's orbit impact the amount and distribution of solar radiation that reaches different parts of Earth's surface during different seasons. Changes to the angle and orientation of Earth's rotation axis affect the distribution of solar energy in different latitudes.

Long-Period Variations in Surface Temperature on Earth Are Caused by a Variety