Question

Mushroom-shaped structures having slender columns and wide tops resulting from the abrasive action of wind are known as:

• A. Brazil nuts
• B. Ventifacts
• C. Drass
• D. Pedestal rocks

Hint:

Pedestal rocks are formed by differential wind abrasion near the ground surface.

Answer 1

The Correct Option is D

Concept:
Wind erosion produces several landforms in arid and semi-arid regions. Abrasion is the sand-blasting action of wind.

Step 1: Understand the described shape.
The question describes a mushroom-shaped structure with a narrow base and wider top.

Step 2: Cause of formation.
Wind abrasion is stronger near the ground because sand particles move close to the surface. Therefore, lower parts of rocks are eroded more than upper parts.

Step 3: Identify the landform.
Such mushroom-shaped rocks are known as pedestal rocks. \[ \text{Mushroom-shaped wind-eroded rock}=\text{Pedestal rock} \] \[ \therefore \text{Correct Answer is (D)} \]