PT 14 S3 Q3

   It is a fundamental tenet of geophysics that theEarth's magnetic ... ...

The author mentions the creation of blobs of different temperatures in the Earth's outer core (lines 41-46) primarily in order to
(A) present a way in which the venting of heat from the outer core might disturb the heat-circulation pattern within the outer core
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Science & Technology Mix 1