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The lines on the Earth’s surface that join points of equal magnetic variation are called…
  • A
    isogonals
  • B
    isoclines.
  • C
    isotachs.
  • D
    isogrives.

Isogonal is mathematical term which means having the same angles.
So the variation lines cut the meridians with the same angle making agrees with the same magnetic variation.

Isogonic lines (isogonal): same magnetic variation.
Agonic: Zero magnetic variation.
Isoclinal: same magnetic dip.
Aclinic: Zero magnetic dip.

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