Hi my name is H2 jOe. I am going to tell you the story of the Earth's atmosphere. We are starting off when the Earth was made 5 billion years ago
4 billion years ago the hydrosphere formed from water vapor and condensation.
Oxygen was absent in the early years of the Earths atmosphere.
1 Billion years ago Blue Green Algae started to grow by using the suns rays to make energy, in a process called Photosynthesis
Now these are my friends the ozone triplets, they are going to tell you about what they do.
Hi we are the ozone triplets we are made of three oxygen molecules. Our Job is to protect the earth of harmful UV rays from the sun.
Now because of my friends the ozone triplets and their many family members and the presence of oxygen, 600 million years ago organisms could form. That developed into the organisms that are on the Earth today.