Geo
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Proses-proses geomorfologi yang giat berlaku mengikut peringkat-peringkat sungai ialah: Peringkat muda/hulu sungai - jenis hakisan mendalam dan unduran kebelakang - cara hakisan hidrol - pergerakan jisim iaitu tebing runtuh dan robohan batu Peringkat tengah/dewasa sungai - jenis hakisan melebar - cara hakisan lagaan dan geselan - sedikit pemendapan - pergerakan jisim iaitu tebing runtuh Peringkat hilir/tua sungai - jenis hakisan melebar sangat giat - cara hakisan geselan dan hidrol di likuan sungai - pemendapan banyak berlaku - pergerakan jisim iaitu tebing runtuh
