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Difficulty: EasyLandform Evolution by Running Water and Underground Water

Which of the following landforms is formed primarily by river deposition in its lower course?

  1. DeltaAnswer
  2. B
    Gorge
  3. C
    Soil creep
  4. D
    Marble cave

Answer

Delta
A delta is formed in the lower course of a river where the gradient flattens and water flow slows down drastically upon reaching a sea or lake. This reduction in velocity causes the stream to deposit its load of sand, silt, and clay at the mouth.

Step-by-Step Solution

1
Identify the stage of the river and process specified in the prompt
The question asks for a feature formed by river deposition in its lower course.
River courses are divided into upper (erosional), middle (transportational/depositional), and lower (predominantly depositional) stages.
2
Evaluate the landform options against the course and process
Deltas are built when a river enters a lake or sea in its lower course, reducing velocity and depositing its sediment load.
Other options represent upper-course erosional features, mass wasting, or metamorphic rock features.

Key Concept

Fluvial Deposition and River Stage Features
Estimated Time:45s
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Topics

Landform Evolution by Running Water and Underground Water

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