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During the Cenozoic, the Earth was cooling and sea levels were rising. The climate was moderated and warmer in the Mesozoic because of high carbon dioxide in the atmosphere.

Before the Cenozoic Era, the earth was still quite warm and had some very wet conditions. The final breakup of Pangaea also occurred during this time evidence shows that there was change in oceans circulation.

As a major event Antarctica broke away from Australia, it then moved over the South Pole. This caused the warm ocean current that had been flowing past Antarctic to be reversed. A cold current began to surround it. The climate of Antarctica cooled, and glaciers formed. With these massive changes in temperatures, land mass movement and changes in ocianic flow the environment became quite unstable.

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Q: Why was the climate so eratic in the Cenozoic when it was so moderated in the Mesozoic?
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