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Earthy Earthy
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Posts: 1022
7 years ago
Examine the cross-section through a hypothetical ocean basin. Use the magnetic time scale at left to determine when continents A and B separated from one another. Justify your answer.
Textbook 

Foundations of Earth Science


Edition: 7th
Authors:
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Richy271Richy271
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7 years ago
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  Each side of the oceanic ridge shows the same pattern, but the left side is a mirror image of the right. Crust closer to the ridge is younger. It shows a "normal" magnetic polarity, and then there is a thin red ("reversed" polarity) stripe, a thinner white stripe (the Jaramillo normal subchron, and then a thicker red stripe (middle of the Matuyama reversed chron, and then another thin white stripe next to the continental crust. This last one must be the Olduvai normal subchron, which is 2 million years old. Therefore, the continents separated, and seafloor spreading initiated, around 2 million years ago.
 
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Earthy Author
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7 years ago
Quick and to the point. Thank you.
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7 years ago
I doubled-checked using the textbook, thanks for the feedback.
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Thank you so much
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Thanks!
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Thank you so much
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TY :)
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