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The Astronomical Countdown
The Geological Countdown
The Climatological Countdown
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300 million 65 million Africa anatomically modern humans animals arrived atmosphere atoms Australia Australopithecus bacteria began Big Bang Bronze Cenozoic centred civilisation clock see Figure continental continents cooling core samples countdown clock Cretaceous Cro-Magnons crust dinosaur extinction earlier early modern humans Europe evidence evolution evolved Figure 13b Figure 17 Figure 9 formation formed fossils further galaxies geological countdown glacial periods glacier global Gondwanaland Hemisphere hominids Homo Erectus Homo Habilis Homo Neandertalis Homo Sapiens Sapiens hydrogen Ice Age ice sheets interglacial invented islands land layers Melanesia Mesozoic metres migration million years ago million years BP molten nomadic North America northern occurred oxygen Permian Phanerozoic planet Earth plates population present day probably Proterozoic Quaternary Ice Age Radiometric dating Ramapithecus religion rock Sahara sea levels seconds before midnight South Southeast Asia southern species Stone Age subduction surface temperature tion tropical Upper Palaeolithic vast warm warmer westwards Wurm glacial