Youthful River
A river with a steep gradient that has very few tributaries and flows quickly. Its channels erode deeper rather than wider.
Mature River
A river with a gradient that is less steep than those of youthful rivers and flows more slowly. A mature river is fed by many tributaries and has more discharge than a youthful river. Its channels erode wider rather than deeper.
Old River
A river with a low gradient and low erosive energy. Old rivers are characterized by flood plains.
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