An Isopach map has lines that show the thickness of stratum, or soil and sedimentary rock. This is very significant to professions such as drillers because they need to know what they are up against when drilling into the Earth. In this example from New Zealand, the reader can see how much thicker the rock gets as you go away from the coast. This map can also be a Choropleth map because of its use in shading as well as lines.
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