12. Climate and its effects

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From about 2 million BC to about 8,000 BC, there were periodic changes in the climate on earth. The climate fluctuations were alternating between ice ages and warmer periods (interglacials) with about one hundred thousand years between each. During these interglacials, there was an abundance of rainfall near the equator, and temperate climates were experienced closer the poles. The interglacials gradually grew colder until most of the earth was covered in ice. Then, the ice age would suddenly reach its end and a new interglacial would take its position, and so the cycle continued.

Sources: Ancient Origins Manual (pg 23)

-Shelby Jordan