The Big Bang
By: Sethra & Alyssa
13,820,000 Billion years ago the Big Bang occured.
Our Sun 5.01 Billion years ago
The sun was formed by the atoms hydrogen, helium, and some other atoms. The creation of the sun probrobaly formed many other stars in our solar system. it was formed from the collapse of part of a giant molecule.
The Earth 4.6 Billion years ago
The earth was formed from a vast gas and dust particles clumped together forming astriods. As the astriods kept forming into one big clump, the earth was formed. The earth was created about 4.6 billion years ago.
Cells 3.8 Billion years ago
The first cell was formed 3.8 billion years ago. The birth of the cell marked the most important factor that created who we are today. Scientists discovered that the first cell that was created was prokyriotic.
The Levels of Oxygen 3.3 Billion years ago
3.3 Billion years ago the level of oxygen started to increase in the solar system. The increase of oxygen was caused by photosynthesis from the first species of plants on earth. As the number of green plants increased the levels of oxygen atoms would increase in the atmosphere.
In the Cambrian Explosion, molluscs, arthropods, echinoderms, crustaceans, myriapedes, and arachnids were discovered (the major animal phylum).
When the 5 Major Extinctions Occured
1. 450 Billion years ago
2. 375 Billion years ago
3. 250 Billion years ago
4. 220 Billion years ago
5. 25 Billion years ago