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1- Explain why the following lines are crucial to physical geography: North Pole, South Pole, Tropic of Capricorn, International Date Line.
2- Differentiating closed systems from open systems. Give an example of each within the Earth system.
3- If you walked along a parallel, in what direction(s) would you be walking?
If you walked along a meridian, in what direction(s) would you be walking?