Question

Which geomorphic process is primarily responsible for the formation of sand dunes?

• A. Fluvial action
• B. Glacial action
• C. Aeolian action
• D. Marine action

Hint:

{Dunes = Wind = Aeolian}. Always associate desert landforms with aeolian processes.

Answer 1

The Correct Option is C

Step 1: Understanding sand dune formation.
Sand dunes are depositional landforms composed mainly of sand and are commonly found in deserts and coastal regions. Their formation depends on the transportation and deposition of loose sand particles.
Step 2: Role of geomorphic agents.
Different geomorphic agents such as rivers, glaciers, wind, and sea waves shape the Earth’s surface. Each agent produces distinct landforms based on its mode of action.
Step 3: Identifying the responsible process.
Wind action, also known as aeolian action, is responsible for the erosion, transportation, and deposition of sand in arid and semi-arid regions. Continuous wind movement leads to the accumulation of sand into dune structures.
Step 4: Evaluation of options.
(A) Fluvial action: Forms riverine features like floodplains and deltas.
(B) Glacial action: Produces landforms like moraines and drumlins.
(D) Marine action: Forms coastal features such as beaches and cliffs.
Step 5: Conclusion.
Since sand dunes are formed by the action of wind, the correct answer is (C) Aeolian action.