CHAPTER 25 THE HISTORY OF LIFE ON EARTH 1. Artists Conception of Earth 3 billion years ago 2.
Geologic Time Scale
The Origins of Life on Earth (or, a History of our planet in a week or less) Biology 2, College of the Atlantic Spring 2002.
Biology Semester 2 Agendas
Earth Systems and Resources
Geologic Time Scale 4.6 Billion years ago to the present