Earth had a very long history, but how did it get a history? The earth first formed and grew from there. It first formed 4.6 billion years ago. It helped us grow and create life.
After the earth was formed, then came the first microbal on earth. They started to create life which started to change the world. It cames 3.5 billion years ago.
After the first microbal life came, it was a big game changer. Then the first plants on earth started to come and produce more oxygen. It started to form 438-408 mya.
The devonian period came along, called "The Age of Fishies". Fish and land plants become abundant and diverse. They started to become more popular and reproducing. Sharks were reproducing, coral reefs, and much more. This was from 408-360 mya.
After the "Age of fishes" started, then came the Pennsylvanian period. This period was the start of reptiles. Not only reptiles but ferns came along and cockroaches. It changed the earth because the ferns could produce more oxygen and the animals could reproduce.
After the devonian period, dinosaurs came along. The dinosaurs were important because they gave lots of information when they went extinct. Many scientists use them to see the evolution of them. They were here 248-65 mya.