The questions refer to this cross section, which depicts magnetized oceanic crust at a spreading center. The "+" symbol indicates positive (normal) magnetic anomalies; the "-" symbol indicates negative (reversed) magnetic anomalies.

-How fast are points C and D spreading apart from each other?

Question

The questions refer to this cross section, which depicts magnetized oceanic crust at a spreading center. The "+" symbol indicates positive (normal) magnetic anomalies; the "-" symbol indicates negative (reversed) magnetic anomalies.
 
-How fast are points C and D spreading apart from each other?

Quizplus · Accepted Answer

Points C and D are separated by approximately 5-6 positive (normal) and negative (reversed) magnetic anomalies, which corresponds to a distance of about 500-600 kilometers. The age of the oceanic crust between these points is about 5-6 million years. Dividing the distance by the age gives a spreading rate of approximately 100 millimeters/year.

The Questions Refer to This Cross Section, Which Depicts Magnetized