
Thematic maps are usually very simple maps the just convey and particular theme or phenomena, such as population density, over a geographic area. Sometimes they can focus more on the theme or phenomena than actually the geographic data and may use it more as a baseline. This map however, is a fairly detailed depiction of Africa, Europe, and the America's, but it is a thematic map because it displays the lines of equal magnetic variation. It was the first map of its time and was created by Edward Halley in 101.
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