Physical Geology On-line Lab and Helpful Lab Hints

Exercise 17: Plate Tectonics

Problem 1

1. The "anomalies" referred to are the strong and weak signals recorded by a magnetometer towed above the ocean floor. Examine the map and use the annotated version to help you locate the peaks.
   • annotated map from p. 332
2. Label all of the peaks and connect the peaks with the same numbers.
   • another annotated map from p. 332
3. Hint: they do.
   • Read the lab book discussion of Divergent Boundaries (p.324-326)
   • Look at Figure 17.4 on p. 327 in the lab book
   • Look for information on sea-floor spreading in the text book in Chapters 3 and 10
4. rate = distance/time
   • half rate: use the distance from the ridge to peak 4 (time is 7 million years)  
   • full rate: use the distance from peak 4 to peak 4'
   • calculate the rate in km per million years, then convert the answer
     • 10 km/million years = 1 cm/yr (divide km/Myr by 10 to get cm/yr)

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last updated: 2020-04-12