According to the research, the agonic line is the line joining all places of zero variation.
What is the agonic line?
It is a term that refers to the zero declination isogon, that is, it joins the points that do not have magnetic declination.
This line crosses the magnetic and geographic poles of the Earth's surface from which they are aligned and along which there is no magnetic variation.
Therefore, we can conclude that according to the research, the agonic line is the line joining all places of zero variation.
Learn more about magnetic declination here: https://brainly.com/question/14071370
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