4.57 billion years ago scientist theorize The Big Bang Theory happened. Causing the formation of not only Earth but also other planets and the solar system we know today. It is theorized that the death of a star caused a huge explosion with the bonding and separating of elements such as CO2 and methane.
Oldest Geological Evidence of Life
There is 3 different theories on how the Moon was formed. The most popular and supported one is called the Giant Impact Theory. Which entails a big object impacting the Earth causing a lot of debris in space which eventually formed a gravity field allowing for the planet to have a orbit cycle.
Evolution of Multi cellular Organisms
4 billion years later Earth developed a mantle and crust. At that time also Earth had no life on it because before then Earth was only magma rotating the Sun. Only 1.5 billion year later would Earth start to have life and progress to the Earth we know today.
Appearance of Modern Humans
The oldest geological evidence of life on earth was dated 3.5 million years ago. Scientists use this information to determine where certain plants and animals go in a time line. It also helps scientists figure out where the earth actually supported life.
The evolution of multi-cellular organisms came into effect around 2 billion years ago. They evolved from single-celled organisms to create plants and animals and led to life on earth
The appearance of modern humans was around 200,00 years ago. They affected the world by introducing agriculture to different parts of the world. They have also created green house gasses which hurt the earth by destroying the ozone