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Which of the following best approximates the rate of seafloor spreading across the Shivering Ridge (A-A’) during the first 20 Ma of seafloor spreading? a. 5.4 mm/ year b. 7.9 mm/ year c. 13.8 mm/ year d. 18.3 mm

Which of the following best approximates the rate of seafloor spreading across the Shivering Ridge (A-A’) during the first 20 Ma of seafloor spreading? a. 5.4 mm/ year b. 7.9 mm/ year c. 13.8 mm/ year d. 18.3 mm

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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29) Which of the following best approximates the rate of seafloor spreading across the Shivering Ridge (A-A’) during the first 20 Ma of seafloor spreading?

a. 5.4 mm/ year

b. 7.9 mm/ year

c. 13.8 mm/ year

d. 18.3 mm/ year

e. 22 mm/ year

30) When did the Narrow Sea open (D – D’)?

a. 2.5 Ma (million years ago).

b. 12.5 Ma.

c. 5.5 Ma

d. 20 Ma

e. 125,000 years ago

Magnetic Lineations of the Sea Floor Across Mid-Ocean Ridges GAME OF SONES Magnetic Time Scale O Present Ridge Axis D D' Northern Narrow Sea Ridge 10 Ma* 20 Ridge Axis 30 40 A A' 50 The Shivering Sea Ridge 60 70 \Ridge Axis В B' Southern Narrow Sea Ridge Ridge Axis C' Sunset Sea Ridge 400 800 Scale 1200 1600 2000 km Figure 4 Magnetic Data *Million Years Before Present
Transcribed Image Text:Magnetic Lineations of the Sea Floor Across Mid-Ocean Ridges GAME OF SONES Magnetic Time Scale O Present Ridge Axis D D' Northern Narrow Sea Ridge 10 Ma* 20 Ridge Axis 30 40 A A' 50 The Shivering Sea Ridge 60 70 \Ridge Axis В B' Southern Narrow Sea Ridge Ridge Axis C' Sunset Sea Ridge 400 800 Scale 1200 1600 2000 km Figure 4 Magnetic Data *Million Years Before Present
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