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47. Assume that a representative value of sea floor spreadIng Is 3 cm/year. If the earth's magnetlc fleld reverses on average every 0.4 mllton years, what Is the average width of magnetic bands of reversed remnant magnetism perpendicular to mid-ocean rldges? a. 20 meters b. 16 km C. 80 km d. 12 km

47. Assume that a representative value of sea floor spreadIng Is 3 cm/year. If the earth's magnetlc fleld reverses on average every 0.4 mllton years, what Is the average width of magnetic bands of reversed remnant magnetism perpendicular to mid-ocean rldges? a. 20 meters b. 16 km C. 80 km d. 12 km

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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47. Assume that a representative value of sea floor spreadIng Is 3 cm/year. If the earth's magnetic fleld reverses on average every 0.4 mlllon years, what Is the average width of magnetic bands of reversed remnant magnetism perpendicular to mld-ocean ridges? a. 20 meters Ib. 16 km C. 80 km d. 12 km.
Transcribed Image Text:47. Assume that a representative value of sea floor spreadIng Is 3 cm/year. If the earth's magnetic fleld reverses on average every 0.4 mlllon years, what Is the average width of magnetic bands of reversed remnant magnetism perpendicular to mld-ocean ridges? a. 20 meters Ib. 16 km C. 80 km d. 12 km.
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