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The Earthâ âs Magnetic Field Curved field lines cause a magnetic needle to tilt. ï¼â¯ Angle between magnetic field line and surface of the Earth is called inclination. It depends on: ï¼â¯ ï½â¯ Latitude Fig. 2.4d Essentials of Geology, 4th edition, by Stephen Marshak © 2013, W. W. Norton Chapter 2: The Way the Earth Works: Plate Tectonics