The passage suggests which of the following about surges in the Earth's
A. They occur cyclically every few decades.
B. They can be predicted by changes in the Earth's inner core.
C. They are detected through indirect means.
D. They are linked to disturbances in the Earth's atmosphere.
Explanation: passage শুরুর তিনটি লাইন (Especially 3rd) suggest করে, Inner core এর molted iron এর revolution (ঘূর্নন) এর ফলে outer core এর surge সংগঠিত হয়।]
