Isopach maps uses lines to connect points of equal distance. This is useful in al type of drilling and mining. Knowing the thickness lets the companies that do this work know what they have to drill to or mine to reach the material that is of need. This also comes in handy when researching volcanoes. In the map above, it shows the Rio Blanco Tephra Deposit. http://www.geo.utexas.edu/faculty/barker/kempter/rbtephra.html
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