The last ice age led to the rise of the woolly mammoth and the vast expansion of glaciers, but it's just one of many that has chilled Earth throughout the planet's 4.5-billion-year history.
The last ice age led to the rise of the woolly mammoth and the vast expansion of glaciers, but it's just one of many that has chilled Earth throughout the planet's 4.5-billion-year history.
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