Which of the following is not true about rivers?
A) Major rivers, like the upper Mississippi near the Great Lakes, must be relatively old rivers.
B) The boundary between hard rocks and soft rocks can be marked by waterfalls.
C) Loading and unloading of the crust by ice sheets can change the direction that rivers flow.
D) Different parts of a river can be different ages.
A) Major rivers, like the upper Mississippi near the Great Lakes, must be relatively old rivers.
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