Phanerozoic Earth History
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Phanerozoic Earth HistoryQuestions
- 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?