LOOR PLATE TECTONICS Figure III-22 Sea-Floor Spr 1-22 Sea-Floor Spreading in the
ID: 290499 • Letter: L
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LOOR PLATE TECTONICS Figure III-22 Sea-Floor Spr 1-22 Sea-Floor Spreading in the South Atlantic 38 m y 65 my STUDY QUESTIONS 23. How does the direction of the magnetic field at a particular point on Earth differ before and after a polarity reversal takes place? Refer to Figure III-16 and Figure III-17. 24. In the exercise using Figure II1-22 you used the age of the ocean floor as determined from the striped magnetic pattern to reconstruct the ancient positions of South America and Africa with respect to one another. Can you reconstruct the ancient latitudes of South America and Africa from the ocean floor age data? If so, what are they? If not, what additional data would you need?Explanation / Answer
1) The main source of polarity is liquidus outer core which generates magnetic field.
In reverse polarity, these North and South pole interchange, the difference between normal polarity and reversal polarity is negligible as far as only earth is concerned but when we consider sun then that may cause harmful effects on earth.
2) in diagram, we can see that there are three ages of ocean floor are given, and younger will 5 my, older will be 65 my
Here we will need the spreading rate of ocean floor ( with what speed it is moving ( on either side of the ridge ) and proper scale on the map
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