GEOLOGY
GEOMORPHOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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may develop a delta at their base
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may develop a gorge
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No changes
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None of the above
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Detailed explanation-1: -Over time, the softer rock is eroded further creating an over hang of hard rock. This overhang is unstable as it’s weight is unsupported. Eventually, this hard rock collapses because it is unsupported and the waterfall moves back upstream. This creates Gorges, which are steep sided deep river valleys.
Detailed explanation-2: -Streams carve through hard layers of rock, breaking down or eroding it. Sediment from the worn-away rock is then carried downstream. Over time, this erosion will form the steep walls of a gorge. The flooding of streams or rivers increases the speed and intensity of this erosion, creating deeper and wider gorges.
Detailed explanation-3: -A waterfall is a sudden fall of water that occurs where there are rapid changes in gradient in the river’s course. GORGES; A narrow valley between hills or mountains, typically with steep rocky walls and a stream running through it.
Detailed explanation-4: -In addition to gradual processes such as erosion, earth movement caused by earthquakes or landslides or volcanoes can lead to the formation of waterfalls.