I believe that 70% is your answer. (source: answers)
These are divergent boundaries! The magnetic poles being reversed can be proved but how the mountain range is now being pulled out. On convergent boundaries can create a mountain range by land colliding. Therefore, since the land is moving away from the center, it has created a divergent boundary on a set of mountains.
<span>The plains tend to be very easy for early settlements to bring about agriculture, mobility, and mild weather conditions that helps early civilization grow. The negative impact of most plains come from it's lack of ability to trade easily in later generations, without water access.</span>
I found this photo it might help in your case :)