Phanerozoic Earth History

Topic Page

Questions

• What is Snowball earth, when did it occur, and what impact did it have on life on earth?
• What lifeforms characterize the Quaternary period?
• How was the O-zone formed and why is it important for life on earth?
• What are the major stages in the history of life on Earth?
• How was the Cretaceous period different from the Jurassic Period?
• What are the divisions of the geologic time scale?