study questions 3

study questions 3 - Elementary Oceanography(OCE1001 Study...

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Elementary Oceanography (OCE1001) Study Questions #3 Fall 2011 These questions are based on class material and chapter 2 in Trujillo and Thurman (2011). 1. What characteristic of the seafloor supports the idea that subduction must take place? 2. What is the relationship between the magnetic north pole and the geographic north pole? 3. New crust is formed at ___________ (ocean-floor feature) and old crust is subducted at ____________ (ocean-floor feature). 4. Do you find older seafloor rocks at mid-ocean ridges or in trenches? 5. What type of plate boundary has the most earthquakes? 6. Are deep-focus earthquakes more common in trenches or along mid-ocean ridges? 7. Does the magnetic field of the Earth reverse itself each time magma erupts at a mid-ocean ridge? 8. Give an example of a fast-moving spreading ridge and a slow-moving ridge. Which one tends to be more gently sloped than the other? 9. Are deep-sea trenches found at convergent or divergent plate boundaries?
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