American West

Maps showing consequences of Aridity

 

Figure 3-1 Image of nighttime `city lights' for the continental U.S.

Figure 3-2 UN/FAO soils map of the U.S., soils ranked by FCC limiting factors.

A soils map of the United States created from the United Nations Food and Agriculture Organization digital soils map of the world. Soils are classified by their number of agronomic limiting factors. Soils with a high number of limiting factors are problematic and require remediation for agricultural production. The best soils for agriculture have no or few limiting factors.

(Spource: http://biology.usgs.gov/luhna/chap3.html)