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Question

Difficulty: MediumLandform Evolution by Running Water and Underground Water

Match each fluvial or subterranean groundwater feature listed in Column A with its corresponding defining formation mechanism or spatial characteristic in Column B.

  • Interlocking spursAlternating projections of resistant rock in a youth-stage V-shaped valley around which a river winds its course.
  • PoljeA large, flat-floored basin in karst terrain formed by the coalescence of sinkholes and extensive chemical solution.
  • Natural leveeA raised embankment of coarse sediment deposited naturally along stream margins during flood conditions.
  • StalagmiteA mound of calcite built up vertically from a cave floor due to precipitation of calcium carbonate from dripping water.

Answer

Interlocking spurs match with alternating projections of resistant rock in a youth-stage V-shaped valley; Polje matches with a large, flat-floored basin in karst terrain formed by sinkhole coalescence; Natural levee matches with a raised embankment of coarse sediment deposited along stream margins during flood conditions; Stalagmite matches with a mound of calcite built up vertically from a cave floor.
Each landform is accurately paired according to its characteristic formative process: interlocking spurs represent upper-course fluvial erosion, polje is a massive surface karst solution basin, natural levee is a lower-course river depositional embankment, and stalagmite is a subterranean karst precipitation feature.

Step-by-Step Solution

1
Categorize each given geomorphic landform by its primary process environment (fluvial erosion, fluvial deposition, surface karst, or subterranean karst).
Interlocking spurs are upper-course fluvial erosional features; poljes are surface karst solution features; natural levees are lower-course fluvial depositional features; stalagmites are subterranean karst depositional features.
Grouping landforms by agent and stage simplifies identification of matching physical descriptions.
2
Match interlocking spurs with the upper-course river channel profile.
Interlocking spurs correspond to the alternating projections of resistant rock in a V-shaped valley.
Vertical headward cutter erosion in the youth stage forces streams around obstacles rather than through them.
3
Match polje with its characteristic karst surface landform scale and origin.
Polje corresponds to a large flat-floored basin produced by sinkhole coalescence and solution.
Poljes represent advanced surface solution features in limestone regions.
4
Match natural levee with its flood plain deposition mechanism.
Natural levee corresponds to raised embankments of coarse sediment along stream banks.
Fluvial flooding causes rapid loss of hydraulic energy at bankfull margins, dropping heavy sediment first.
5
Match stalagmite with its cave dripstone growth orientation.
Stalagmite corresponds to calcite mounds building up vertically from cave floors.
Calcium-rich drips falling from the cave roof lose carbon dioxide upon reaching the floor, depositing calcium carbonate upward.

Key Concept

Classification of landforms produced by surface stream action and underground carbonation-solution processes
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Topics

Landform Evolution by Running Water and Underground Water

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