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D. What is the average rate at which the rocks at Point A have moved away from the spreading axis (over the whole life of the ocean)? Show your work and give your answer in cm/yr.

D. What is the average rate at which the rocks at Point A have moved away from the spreading axis (over the whole life of the ocean)? Show your work and give your answer in cm/yr.

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
Problem 1LR
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Exercise 2 Figure 2 shows an ocean basin that contains a divergent plate boundary. The ages of rocks (basalts) on the ocean floor are given in millions of years (each shade of grey represents a different age.) A. How old is this ocean? B. What is the age of the rocks (sea floor) at Point A? C. What is the age of the rocks (sea floor) at Point B? D. What is the average rate at which the rocks at Point A have moved away from the spreading axis (over the whole life of the ocean)? Show your work and give your answer in cm/yr. E. Has the spreading rate been constant over the whole life of the ocean? F. How wide is the ocean now? G. When the oldest oceanic crust in this ocean basin dates to 160 million years, how wide was the ocean? H. Imagine this area 220 million years ago. How many continents would be in the picture?
Transcribed Image Text:Exercise 2 Figure 2 shows an ocean basin that contains a divergent plate boundary. The ages of rocks (basalts) on the ocean floor are given in millions of years (each shade of grey represents a different age.) A. How old is this ocean? B. What is the age of the rocks (sea floor) at Point A? C. What is the age of the rocks (sea floor) at Point B? D. What is the average rate at which the rocks at Point A have moved away from the spreading axis (over the whole life of the ocean)? Show your work and give your answer in cm/yr. E. Has the spreading rate been constant over the whole life of the ocean? F. How wide is the ocean now? G. When the oldest oceanic crust in this ocean basin dates to 160 million years, how wide was the ocean? H. Imagine this area 220 million years ago. How many continents would be in the picture?
Figure 2. Connolly, Goodricl, continent 1 f plate 1 Divergent Plate Boundary 200 180 160 120 80 40 1 ocean floor (basalt) plate 1 0 A continent 2 scale (km) 2000
Transcribed Image Text:Figure 2. Connolly, Goodricl, continent 1 f plate 1 Divergent Plate Boundary 200 180 160 120 80 40 1 ocean floor (basalt) plate 1 0 A continent 2 scale (km) 2000
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