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Can all the questions be answered if possible. Thank you! What is the average speed at which Bna drifted away from the ridge at A during the past 67.7 Myr expressed in mm/yr? Show your work.

Can all the questions be answered if possible. Thank you! What is the average speed at which Bna drifted away from the ridge at A during the past 67.7 Myr expressed in mm/yr? Show your work.

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
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Can all the questions be answered if possible. Thank you!

What is the average speed at which Bna drifted away from the ridge at A during the past 67.7 Myr expressed in mm/yr? Show your work.

 

2. The area between CNA and BNA in Fig. A2.7.1 consists of oceanic lithosphere added along the Mid-Atlantic Ridge to the North American Plate between 154.3 and 67.7 Myr. What is the average speed at which new lithosphere was added to the North American Plate along that line? Show your work. mm/yr Do the same analysis for the lithosphere between points CAF and BAF- What is the average speed at which new lithosphere was added to the African Plate along that line? mm/yr Which plate moved faster relative to the ridge between 154.3 and 67.7 Myr, if either? B Given your answers in part A, did the North Atlantic Ocean Basin develop by adding lithosphere symmetrically along the mid- ocean ridge, or was new lithosphere added more rapidly to one side than the other? If spreading was asymmetric, which plate had more lithosphere added, or did the asymmetry vary from plate to plate over time? C Use the rates that you calculated previously and the map scale to estimate when the coastlines of North America and Africa might have last touched before they were separated by the opening of the North Atlantic Ocean Basin. D REFLECT & DISCUSS Based on the rates you calculated previously, estimate the number of meters that Africa and North America have moved apart since the United States was formed in 1776. Discuss what you did to accommodate the uncer- tainty in your estimate.
Transcribed Image Text:2. The area between CNA and BNA in Fig. A2.7.1 consists of oceanic lithosphere added along the Mid-Atlantic Ridge to the North American Plate between 154.3 and 67.7 Myr. What is the average speed at which new lithosphere was added to the North American Plate along that line? Show your work. mm/yr Do the same analysis for the lithosphere between points CAF and BAF- What is the average speed at which new lithosphere was added to the African Plate along that line? mm/yr Which plate moved faster relative to the ridge between 154.3 and 67.7 Myr, if either? B Given your answers in part A, did the North Atlantic Ocean Basin develop by adding lithosphere symmetrically along the mid- ocean ridge, or was new lithosphere added more rapidly to one side than the other? If spreading was asymmetric, which plate had more lithosphere added, or did the asymmetry vary from plate to plate over time? C Use the rates that you calculated previously and the map scale to estimate when the coastlines of North America and Africa might have last touched before they were separated by the opening of the North Atlantic Ocean Basin. D REFLECT & DISCUSS Based on the rates you calculated previously, estimate the number of meters that Africa and North America have moved apart since the United States was formed in 1776. Discuss what you did to accommodate the uncer- tainty in your estimate.
Atlantic Seafloor Spreading Activity 2.7 Name: Course/Section: Date: Learning GOAL You will use isochrons on a map of marine magnetic anomalies to explore how the northern Atlantic Ocean Basin opened over the past - 154 million years. A The map of the northern Atlantic Ocean Basin (Fig. A2.7.1) shows isochrons (lines of equal age) of the basaltic crust beneath the sediments that have accumulated on the seafloor. These isochrons were derived by Maria Seton and her colleagues (2012) from an analysis of marine magnetic anomalies, and their ages are based on the geomagnetic polarity time scale. GPlates (http://www.gplates.org) was used to help make this map. The red line on the map shows the location of the divergent boundary-the axis of the mid-ocean ridge-between the North American and African Plates. 60 W 30°W North American Plate CNA African Plate 30°N CAF BNA BAF 1500 km 154.3 Мyr (М25) approximate scale at center of map Figure A2.7.1 A The approximate great-circle distances between the points identified on the map are listed in Fig. A2.7.2. The uncertainty in the distances provided is probably on the order of 10 km. CNA to BNA 1354 km CNA to A 2617 km BNA to A 1338 km CAF to A 2599 km Bar to A 1320 km BNA to Bar 2649 km Сдr to Bar 1279 km CNA to CAF 5107 km Figure A2.7.2 A 1. What is the average speed at which BNA drifted away from the ridge at A during the past 67.7 Myr expressed in mm/yr? Show your work. mm/yr What is the average speed that BAF drifted from A?. mm/yr Which plate moved faster relative to the ridge over the past 67.7 Myr, if either? 154.3 Myr (M25) 67.7 Myr (31y) Today 67.7 Myr (31y)
Transcribed Image Text:Atlantic Seafloor Spreading Activity 2.7 Name: Course/Section: Date: Learning GOAL You will use isochrons on a map of marine magnetic anomalies to explore how the northern Atlantic Ocean Basin opened over the past - 154 million years. A The map of the northern Atlantic Ocean Basin (Fig. A2.7.1) shows isochrons (lines of equal age) of the basaltic crust beneath the sediments that have accumulated on the seafloor. These isochrons were derived by Maria Seton and her colleagues (2012) from an analysis of marine magnetic anomalies, and their ages are based on the geomagnetic polarity time scale. GPlates (http://www.gplates.org) was used to help make this map. The red line on the map shows the location of the divergent boundary-the axis of the mid-ocean ridge-between the North American and African Plates. 60 W 30°W North American Plate CNA African Plate 30°N CAF BNA BAF 1500 km 154.3 Мyr (М25) approximate scale at center of map Figure A2.7.1 A The approximate great-circle distances between the points identified on the map are listed in Fig. A2.7.2. The uncertainty in the distances provided is probably on the order of 10 km. CNA to BNA 1354 km CNA to A 2617 km BNA to A 1338 km CAF to A 2599 km Bar to A 1320 km BNA to Bar 2649 km Сдr to Bar 1279 km CNA to CAF 5107 km Figure A2.7.2 A 1. What is the average speed at which BNA drifted away from the ridge at A during the past 67.7 Myr expressed in mm/yr? Show your work. mm/yr What is the average speed that BAF drifted from A?. mm/yr Which plate moved faster relative to the ridge over the past 67.7 Myr, if either? 154.3 Myr (M25) 67.7 Myr (31y) Today 67.7 Myr (31y)
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