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It is clear from the passage that the sources of the Mississippi's waters ----.
The Mississippi is one of the world's great continental
rivers, like the Amazon in South America, the Congo
in Africa, or the Volga in Europe. Its waters are
gathered from two-thirds of the US and, together with
the Missouri, which is its chief western branch, the
Mississippi flows some 6.400 kilometres from its
northern sources in the Rocky Mountains to the Gulf
of Mexico, which makes it one of the world's longest
waterways. The Mississippi has been called the
“father of waters”. Through all its lower course, it
wanders along, appearing lazy and harmless. But
people who know the river are not deceived by its
benign appearance, for they have had many bitter
struggles with its floods. They have had to learn that
nothing is to be gained by fighting against the rages
of the mighty stream. To control it, Americans have
had to accept some of the river's own terms and to
undertake the patient work of conserving and
rebuilding soil, grasslands and forests, far back
where the waters begin to gather.