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Question
Which one of the following is the correct sequence of the following topographical features found from the upper to lower course of a river?
Options:
A .  Estuary → Ox-bow lake → Rapids
B .  Rapids → Ox-bow lake → Estuary
C .  Ox-bow lake → Rapids → Estuary
D .  Rapids → Estuary → Ox-bow lake
Answer: Option B
Answer: (b)
The correct sequence is Rapids- Ox-bow Lake-Estuary
Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence.
An ox-bow lake is a U-shaped body of water that forms when a wide meander from the main stem of a river is cut off, creating a free-standing body of water.
An estuary is a body of water formed where freshwater from rivers and streams flows into the ocean, mixing with seawater.

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