Question

In gully formation process the correct sequence is: A. Rill formation, B. V-shaped gullies, C. U-shaped gullies, D. Tunnel, E. Sheet erosion.

• A. A, B, C, D, E
• B. B, C, D, E, A
• C. D, E, C, A, B
• D. E, A, B, C, D

Hint:

Gully formation commonly begins with sheet erosion and rill erosion before developing into larger gullies.

Answer 1

The Correct Option is D

Concept:
Gully formation is a gradual process. It starts from removal of a thin layer of soil and finally develops into deeper channels.

Step 1: Sheet erosion.
The process starts with sheet erosion, where a thin layer of soil is removed uniformly. \[ \text{First step}=E \]

Step 2: Rill formation.
As runoff gets concentrated, small channels called rills are formed. \[ \text{Second step}=A \]

Step 3: V-shaped gullies.
Rills enlarge and deepen to form V-shaped gullies. \[ \text{Third step}=B \]

Step 4: U-shaped gullies.
With further erosion and widening, U-shaped gullies are formed. \[ \text{Fourth step}=C \]

Step 5: Tunnel.
Advanced subsurface erosion may result in tunnel formation. \[ \text{Fifth step}=D \] Therefore, the correct sequence is: \[ E,A,B,C,D \] \[ \therefore \text{Correct Answer is (D)} \]