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An illustration depicting the minimum (interglacial, black) and maximum (glacial, grey) glaciation of the northern hemisphere during the ice age that began about 3.2 million years ago. (Image courtesy of Hannes Grobe/AWI/Wikimedia Commons)

True polar wander may be the reason of ice age

Earth's most recent ice age may have been caused by changes somewhere inside the planet. In light of proof from the Pacific Ocean, including...