| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | lignite | United States | Lignite is a major source of energy in certain regions, particularly in Texas and North Dakota. | 1 |
| 2 | lignite | United States | Lignite is a less common source of energy and not widely used for electricity production in the United States. | 1 |
| 3 | lignite | United States | Lignite is less commonly used as an energy source and is considered lower quality compared to other coal types. | 1 |