This is a period of time when extensive glacial ice covered much of earth, producing long-term climate change and causing the extinction of many species on earth.

ice age/ Quaternary glaciation

Explanation:

Ice ages have occurred in the earth history and do occur more or less regularly in a cycle. It is believed that ice ages are as a result of small changes in the earth's orbit and also dependent on the solar cycles. The temperatures on the earth reduce causing the ice sheets in the poles to extend to the subtropics.

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explanation:

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