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নদী উপত্যকার ঢাল হ্রাসের সঙ্গে সঙ্গে নদীর শক্তি ও বােঝা বহনক্ষমতা কমে গেলে আরােহণ প্রক্রিয়া শুরু হয়।
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নদী উপত্যকার ঢাল হ্রাসের সঙ্গে সঙ্গে নদীর শক্তি ও বােঝা বহনক্ষমতা কমে গেলে আরােহণ প্রক্রিয়া শুরু হয়।