The agonic line on an isomagnetic chart indicates the ______.A.magnetic equatorB.magnetic longitude reference lineC.points where there is no variationD.points where there is no annual change in variation
The agonic line on an isomagnetic chart indicates the ______.
A.magnetic equator
B.magnetic longitude reference line
C.points where there is no variation
D.points where there is no annual change in variation
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