The correct answer is Option (3) → (A), (C) and (D) only
In geomorphology, fluvial (river) landforms are classified into those created by the wearing away of the earth (Erosional) and those created by the accumulation of sediment (Depositional).
Analysis of the Options:
- (A) Alluvial Fans: These are Depositional. They form when a stream leaves a narrow mountain canyon and enters a flat plain, suddenly losing velocity and spreading its sediment load in a fan shape.
- (B) River Terraces: These are primarily Erosional. While they represent former floodplains (which involved deposition), a terrace is technically the "step" created when a river erodes vertically into its own old floodplain, leaving remnants high above the current water level.
- (C) Deltas: These are Depositional. They are formed at the mouth of a river where it enters a sea or lake, slowing down and dropping its entire remaining sediment load.
- (D) Flood Plains: These are Depositional. They are flat land areas adjacent to a river that are constructed by the deposition of fine silt and alluvium during periodic flooding.
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