The Questions Refer to This Cross Section, Which Depicts Magnetized

Multiple Choice

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?

A) about 20 millimeters/year
B) about 100 millimeters/year
C) about 50 millimeters/year
D) about 200 millimeters/year