1. Youth: river flows down a steep slope; velocity & eroding power greatest; vertical erosion is high; downcutting & V shaped valleys formed2. Mature: lateral erosion dominates; streams are plenty with good integration; transportational work; alluvial fans, meanders etc formed3. Old: depositional work; formation of extensive floodplains; only lateral erosion; braided channels, oxbow lakes, deltas etc formed

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1. 1. Youth: river flows down a steep slope; velocity & eroding power greatest; vertical erosion is high; downcutting & V shaped valleys formed
2. Mature: lateral erosion dominates; streams are plenty with good integration; transportational work; alluvial fans, meanders etc formed
3. Old: depositional work; formation of extensive floodplains; only lateral erosion; braided channels, oxbow lakes, deltas etc formed