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Coal mining in the United States is an industry in transition. Production in 2017 was down 33% from the peak production of 1,162.7 million short tons (1,055 million metric tons) in 2006. Employment of 50,000 coal miners is down from a peak of 883,000 in 1923.

Explanation:

The United States had three major coal-forming periods: the Pennsylvanian (318-299 million years ago), which formed the Appalachian coal beds; the Cretaceous (145-65 million years ago), which formed coal in Colorado, Utah, and New Mexico; and the early Tertiary (65-35 million years ago), which led to major coal deposits in Wyoming, Montana, North Dakota, and Texas.

the number of calories in each pack of cookies has a greater variation than the number of calories in each pack of crackers.

disequilibrium means that either supply is greater than the demand for an available good, or that the demand for a product outstrips the available supply. it implies that the price for a is either too low creating large demand, or too high creating a large surplus of supply.