Sixth Grade
Worksheets
The World's Longest Rivers: the Mississippi-Missouri River System
The Mississippi-Missouri River system is the fourth-longest river system in the world. The source of the Mississippi River is near Lake Itasca in Minnesota. The Missouri River's source is in the Rocky Mountains at Three Forks, Montana. It is called the Red Rock River there. It erodes a lot of sand and mud as it rushes down the mountains. The Missouri River has been given the nickname "The Big Muddy."
Two thousand three hundred miles later, the Missouri River joins the Mississippi River just north of St. Louis, Missouri. The two rivers have been important .....
