North Dakota leads all the states in the number of coal reserves.
Most of the coal is lignite, though, which does not produce as much energy as other types of coal.
The state also began producing crude petroleum when reserves were discovered near Tioga in 1951.
Farmers in North Dakota produce enough wheat each year to make 108 billion sandwiches.
North Dakota has the smallest proportion of land area covered by forest of any state, less than 1 percent.
