The primary control of glacial-interglacial episodes seems to be variation in the Earth's orbit and inclination to the sun.

Question

Quizplus · Accepted Answer

This is a well-established theory known as Milankovitch cycles, which suggests that changes in the Earth's orbit and tilt affect the amount of solar radiation received by different parts of the planet, contributing to the onset and cessation of ice ages.

The Primary Control of Glacial-Interglacial Episodes Seems to Be Variation