Earth - Earth formed from dust, rock, and ice in space.
The atmosphere of Earth started out as a bunch of gases. As the earth cooled, the water vapor turned into rain and formed the oceans. Continents formed in the oceans and split apart due to the tectonic plates.
Life - Prokaryotes, single-celled organisms without a nuclei, and eukaryotes, single-celled organisms with nuclei, formed in the ocean. Cyanobacteria, a prokaryote, used photosynthesis to turn carbon dioxide into food. During this process, they released oxygen and changed the Earth's atmoshpere to mostly oxygen. Animals evolved very late in the Precambrian Time. They had soft bodies so they left some, but not many, fossils.