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QUESTION

1. Why is it that among all the celestial bodies in the universe, Earth appears to be the only one with a life sustaining environment?

1. Why is it that among all the celestial bodies in the universe, Earth appears to be the only one with a life sustaining environment?

2. Why are the environments so different in various parts of Earth?

3. How did Earth's atmosphere form and why is it so important?

4. How has climate changed over the history of Earth?

5. What is the evidence for the evolution of life and how do we interpret it?

6. What do fossils tell us?

7. When and how did life form?

8. Why does Earth have a relatively stable climate?

9. How does atmospheric carbon dioxide influence Earth's temperature?

10. What is the relationship of atmospheric carbon dioxide to Earth's surface temperature?

11. Where does carbon dioxide primarily come from?

12. How is carbon dioxide consumed on Earth and where does it go?

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