This diagram shows magnetic stripes on either side of the mid-ocean ridge.How many times did the magnetic field change polarity to form all of the stripes shown here?
A)twice
B)three times
C)five times
D)eleven times

Question

This diagram shows magnetic stripes on either side of the mid-ocean ridge.How many times did the magnetic field change polarity to form all of the stripes shown here? 
A)twice 
B)three times 
C)five times 
D)eleven times

Quizplus · Accepted Answer

Each magnetic stripe on either side of the mid-ocean ridge represents a reversal of the Earth's magnetic field. Therefore, to form all of the stripes shown in the diagram, there must have been five reversals (or polarity changes) of the magnetic field.

This Diagram Shows Magnetic Stripes on Either Side of the Mid-Ocean