Study Guide 3

Study Guide 3 - Elementary Oceanography (OCE1001) Study...

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Elementary Oceanography (OCE1001) Study Questions #3Fall 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? Sloping area from trenches along the downward moving plate 2. What is the relationship between the magnetic north pole and the geographic north pole? The geographic North Pole is the spot at the top of the earth according to the rotational axis, and the magnetic north pole is the polar field in which magnetic line up, but these do not coincide. (pg 41) 3. New crust is formed at mid-ocean ridges (ocean-floor feature) and old crust is subducted at ocean trenches (ocean-floor feature). 4. Do you find older seafloor rocks at mid-ocean ridges or in trenches? Trenches. (Pg. 47) 5. What type of plate boundary has the most earthquakes? Transform Plate Boundaries (Pg.60) 6. Are deep-focus earthquakes more common in trenches or along mid-ocean ridges? Trenches (Pg. 67) 7. Does the magnetic field of the Earth reverse itself each time magma erupts at a mid- ocean ridge? No 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? Fast: East Pacific Rise Slow: Mid Atlantic Ridge
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9. Are deep-sea trenches found at convergent or divergent plate boundaries? Convergent (Pg. 56)
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Study Guide 3 - Elementary Oceanography (OCE1001) Study...

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