you should specify which ice age; there have been hundreds. As far as why, that is a great question, and I don’t think anyone has the answer. Ice ages are tied pretty close with atmospheric carbon dioxide levels. Carbon dioxide, you have probably heard, is a greenhouse gas, meaning it traps heat on earth and helps warm it up. Most carbon dioxide is absorbed by the ocean, but the ocean also re-releases a good amount. When ocean water freezes, it pulls the carbon dioxide out of the atmosphere and traps it, and the earth gets a little cooler. The more ice, the more carbon dioxide trapped, the cooler the earth, the more ice, and so forth. Hope this helps.

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