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[[File:Cycle response.jpg|right|thumb|200px|Pangaea, the super-continent 250 million years ago that was the amalgamation of all current present-day [[:category:Continents|continents]].]] | [[File:Cycle response.jpg|right|thumb|200px|Pangaea, the super-continent 250 million years ago that was the amalgamation of all current present-day [[:category:Continents|continents]].]] | ||
===Prehistory and early civilization=== | ===Prehistory and early civilization=== | ||
{{Main|Ancient human civilization}} | |||
The Earth first formed about 4.6 billion years ago, and gave rise to the first single-celled organisms about 3.9 billion years ago. About 200,000 years ago, the ancestors of modern humans, ''Homo Sapiens'', evolved in Africa. Indigenous to Eastern Africa, they gradually spread across the entire planet. Eventually, the humans, originally consisting of groups of hunter-gatherers, began to develop into [[wikipedia:civilization|civilizations]]. These civilizations gradually became more and more complex, with some becoming nation-states and empires. | The Earth first formed about 4.6 billion years ago, and gave rise to the first single-celled organisms about 3.9 billion years ago. About 200,000 years ago, the ancestors of modern humans, ''Homo Sapiens'', evolved in Africa. Indigenous to Eastern Africa, they gradually spread across the entire planet. Eventually, the humans, originally consisting of groups of hunter-gatherers, began to develop into [[wikipedia:civilization|civilizations]]. These civilizations gradually became more and more complex, with some becoming nation-states and empires. | ||