CSIR NET June 2016 Q49: Geomorphology
Different landforms are diagnostic of the erosional or depositional agent that created them: aeolian (wind) features, karst/groundwater dissolution features, fluvial (river) depositional features, and glacial erosional features each have characteristic, recognizable forms.
Demoiselles (also called earth pillars or hoodoos) are classically formed by wind-driven differential erosion of exposed rock. Poljes are large karst depressions formed by groundwater dissolution of soluble bedrock (like limestone). Bajadas are coalesced alluvial fan aprons formed at mountain fronts by river (fluvial) deposition. Corries (cirques) are bowl-shaped hollows carved by glacier erosion at the head of a glaciated valley.
So the matching sequence of agents is: wind, groundwater, river, glacier.
So the matching sequence of agents is: wind, groundwater, river, glacier.
Option 1 is correct, matching each landform to its correct formative agent in order.
Option 2 swaps the first two agents (groundwater, wind), incorrectly assigning groundwater to demoiselles.
Option 3 misassigns glacier to poljes and river to bajada in the wrong order relative to the landform sequence.
Option 4 misorders all four, starting with groundwater for demoiselles rather than wind.
Option 2 swaps the first two agents (groundwater, wind), incorrectly assigning groundwater to demoiselles.
Option 3 misassigns glacier to poljes and river to bajada in the wrong order relative to the landform sequence.
Option 4 misorders all four, starting with groundwater for demoiselles rather than wind.