Question

Which of the following erosional landforms are formed by fluvial action (River)? \[ \begin{aligned} A.&\ \text{Alluvial fans} B.&\ \text{Waterfalls} C.&\ \text{Pot holes} D.&\ \text{Structural benches} \end{aligned} \] Choose the correct answer from the options given below:

• A. A, B and C only
• B. B, C and D only
• C. A, B and D only
• D. A, C and D only

Hint:

Fluvial landforms: \[ \boxed{ \begin{aligned} \text{Erosional} &\rightarrow \text{Waterfalls, Pot Holes}, \text{Depositional} &\rightarrow \text{Alluvial Fans}, \text{Structural Bench} &\rightarrow \text{Controlled by Rock Structure}. \end{aligned} } \] Mnemonic: “Rivers make Fans, Falls and Potholes.”

Answer 1

The Correct Option is A

Concept: River (fluvial) action produces both erosional and depositional landforms. Waterfalls and potholes are erosional features, while alluvial fans are depositional features formed by rivers. Structural benches are primarily structural landforms controlled by rock structure rather than by fluvial action.

Step 1: Evaluate each landform. \[ \begin{aligned} A.&\ \text{Alluvial fans} \rightarrow \text{Fluvial depositional landform (True).} B.&\ \text{Waterfalls} \rightarrow \text{Fluvial erosional landform (True).} C.&\ \text{Pot holes} \rightarrow \text{Fluvial erosional landform (True).} D.&\ \text{Structural benches} \rightarrow \text{Structural landform (False).} \end{aligned} \]

Step 2: Identify the correct combination. \[ \boxed{ A,\ B,\ \text{and}\ C } \] Hence, \[ \boxed{\text{(A)}} \]