1. If you were hiking outdoors and saw a large, isolated boulder, what information would help you to determine if it was a glacial erratic?

2. Why are the toes of some glaciers advancing rather than retreating upslope, even though the atmospheric temperature over those glaciers is increasing?

3. How would a 1 m rise in sea level affect you where you live? What information should you find to answer this question? How would you find that information?

4. What does it mean to say that ice sheets have “nonlinear” behavior in response to warming? Explain how nonlinear behavior works and why its effects are important.