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

The diagram shows five pairs of magnetic stripes, each pair indicating a reversal of the Earth's magnetic field. Therefore, the magnetic field changed polarity five times to form all the stripes.

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