Reversal.
The basic meaning: The act of reversing something - a change to the opposite direction. The business/investment meaning: The change in direction of stocks or fortunes. The law meaning: The...
Paleomagnetism refers to the strength and orientation of the earth's magnetic field at some remote past time. Magnetic field reversals are recorded in deep ocean bottom materials which show that at...
The Earth's magnetic field is created by electric currents flowing roughly parallel to the Equator. There is not necessarily just the one electrical path, and what we see is the net result of several...