A chronic disease persistent or recurring disease, usually affecting a person for three months or longer. It is generally one that is hereditary or one that is the result of factors such as poor diet and living conditions, using tobacco or other harmful substances, or a sedentary lifestyle.yme disease is an example of a chronic disease transmitted to human via deer ticks. Endometriosis is classified as a chronic disease. Using tobacco can increase a person's chances of developing a chronic disease.
The Missouri River is the longest river in the United States. It flows for 2,466 miles (3,968 kilometers). Its source lies in the Rocky Mountains of southwestern Montana; the river is formed by the confluence of the Jefferson, Madison, and Gallatin rivers at Three Forks, Montana.
The Great Falls of the Potomac is 3 miles downstream from here, to the southeast. Little Falls is 11 miles downstream and the estuary, at sea level, begins 13 miles downstream. The distance to the mouth of the Potomac is 130 miles.The river's overall length, from source to mouth, is 382 miles. Its average width from Harpers Ferry to Washington is 1,500 feet, except at Great Falls where it narrows to a 200-foot gorge.uman habitation in the Potomac River Basin has existed for 9,000 years, according to archeological evidence. The name Potomac derives from the Algonquian word patawomeke, which means trading place.. The first English settlement, St. Mary's City, was founded in 1634.