What was early life like ? -Early Earth had an atmosphere toxic to the nowaday human. The air was firey. Fumes from volcanoes surronded the world. There was no Ozone Layer so Ultraviolet Radiation beamed down from the sun. The surface was really hot.
History in Rocks -the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock -when a plant or animal dies in a watery environment and is buried in mud and silt. Soft tissues quickly decompose leaving the hard bones or shells behind. Over time sediment builds over the top and hardens into rock