The Big Bang Theory is the belief that the universe was created by an explosion that occurred over tens of billions of years ago.
Earth's atmosphere began to have an increase of the oxygen molecules. These oxygen molecules caused what we know as the ozone layer. The Ozone layer makes up 0.00006% of the earth's atmosphere. Cyanobacteria helps form this by using photosynthesis,
Law of Superposition
The geological timescale is the ages of time that occurred on Earth. This includes the Precambrian Time, the Paleozoic Era, Mesozoic Era, and Cenozoic Era.
Plate tectonics is the movement of Earth's crust. The continental drift is an example of divergent plate boundaries. Fossil records help support the plate tectonic theory because there are fossils of the same species of animals in different parts of the word.