3. How has the interpretation of the earth's Internal struchure changed in the past several decades? 4 What is the origin of the carth's magnetic field? How did magnetism of the lithosphere support the model of plate tectonics? 5. How does gravity vary across major surface fea- tures of the earth? What is meant by the term İsostatic equilibrium? 6. Summarize the various lines of evidence that were incorporated into the theory of plate tectonics. 7. Describe cach major type of plate boundary. How can these boundaries be recognized at the carth's surface? 8. How is energy distributed by atmospheric crcula tion? Explain why atmospheric cdrculation is broken

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