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* 4 continents: '''Africa-Eurasia''', '''America''', Antarctica, and Australia.
The 7-region model is usually taught in the [[United States]], while the geological 6-continent model is taught in [[Canada]] and in [[East Asia]]. In
During the [[ice age]], the supercontinent of Africa-Eurasia and the Americas was formed, connected with the [[Bering Land Bridge]]. Another land bridge connected Australia and [[New Guinea]] then, and they formed the continent of [[Sahul]]. This can give the following 3-continent model of the ice age: Africa-Eurasia-America, Sahul, and Antarctica.
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