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4.6 billion years ago
The Earth forms and is bombarded by meteorites and comets.
420 million years ago
Land plants evolve, drastically changing Earth's landscape and creating new habitats.
250 million years ago
The supercontinent called Pangea forms. Conifer-like forests, reptiles, and synapsids (the ancestors of mammals) are common.
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.
130,000 years ago
Anatomically modern humans evolve. Seventy thousand years later, their descendants create cave paintings — early expressions of consciousness.