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4.6 billion years ago
The Earth forms and is bombarded by meteorites and comets.
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-116.096607
420 million years ago
Land plants evolve, drastically changing Earth's landscape and creating new habitats.
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250 million years ago
The supercontinent called Pangea forms. Conifer-like forests, reptiles, and synapsids (the ancestors of mammals) are common.
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4 million years ago
In Africa, an early hominid, affectionately named "Lucy" by scientists, lives. The ice ages begin, and many large mammals go extinct.
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40.489673
130,000 years ago
Anatomically modern humans evolve. Seventy thousand years later, their descendants create cave paintings — early expressions of consciousness.
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