Thematic Map

Thematic maps are named accordingly, since they are used to show a connection between a geographical area and a specific theme.  They can be used to show all types of themes, such as incomes or populations.  This specific thematic map displays the coal deposits of the world.

http://geography.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=geography&cdn=education&tm=11&gps=373_251_890_387&f=00&su=p284.9.336.ip_&tt=2&bt=1&bts=0&zu=http%3A//www.mapsofworld.com/thematic-maps/