http://4.bp.blogspot.com/-AFmwgUp73ZA/TbDavVXdmpI/AAAAAAAAACI/sfgXZpjoQyQ/s1600/isopach+1.jpg
Isopachs are drawn on a map to show the amount of thickness of the presented land. This map has different colors to present the different amounts of thickness in the northeastern area of the United States.
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