History of the Earth By Sophia0105 1 CE The Big Bang (13.8 billion years ago) 2 Formation of Earth (4.6 billion years ago) 2 Formation of the Solar System (4.6 billion years ago) 3 Earth's crust and core forms (4.5 billion years ago) 4 First oceans form (4.4 billion years ago) 5 First life - single celled organisms appeared (3.85 billion years ago) 6 Oxygen accumulates in the atmosphere (1.5 billion years ago) 7 First animal (single celled animals) evolved (700 million years ago) 8 Pangea formed (Early Permian Epoch, about 299-273 million years ago) 9 First dinosaurs evolve from lizards (225 million years ago) 10 Breakup of Pangea (Early Jurassic Epoch, about 201 million to 174 million years ago) 11 Dinosaurs go extinct (65 million years ago) 12 Modern humans evolved (130,000 years ago)
