![]() An isoclinic line joins all regions with equal magnetic dip while an aclinic line joins all regions with zero magnetic dip. A contour line that joins all the points with constant magnetic force is called as isodynamic line. The contour line that joins the points of zero magnetic declination is called as Agonic line. The isogon or isogonic contour lines represents the line of constant magnetic declination. It helps in the study of the magnetic dip and magnetic declination. Magnetism: Contour lines are extremely helpful in studying the magnetic field of the earth.
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