Examine the following statements :
A. Main central thrust separates the Greater Himalaya from the Lesser Himalaya.
B. Main Boundary fault separates the Lesser Himalaya from the Shiwaliks.
C. Great Boundary fault separates the Aravalli from Vindhyan System.
Choose the correct answer :

Question

Accepted Answer

Here's a detailed explanation justifying why Option 3 is the correct answer:

**Why Option 3 (A, B and C are correct) is the correct answer:**

*   **Statement A: Main Central Thrust separates the Greater Himalaya from the Lesser Himalaya.** This statement is factually correct. The Main Central Thrust (MCT) is a major geological fault zone that marks the boundary between the high-grade metamorphic rocks of the Greater Himalaya and the lower-grade sedimentary and metasedimentary rocks of the Lesser Himalaya. It's a fundamental structural feature of the Himalayan orogen.

*   **Statement B: Main Boundary Fault separates the Lesser Himalaya from the Shiwaliks.** This statement is also factually correct. The Main Boundary Fault (MBF) is another significant thrust fault that defines the boundary between the Lesser Himalaya and the sub-Himalayan zone, which includes the Shiwalik Hills. It represents a zone of intense deformation and uplift.

*   **Statement C: Great Boundary Fault separates the Aravalli from Vindhyan System.** This statement is also correct. The Great Boundary Fault (GBF) is a prominent geological feature in Rajasthan, India, that separates the older Aravalli mountain range from the younger Vindhyan sedimentary basin. It's a major tectonic boundary in the region.

Since all three statements (A, B, and C) are individually correct and accurately describe major geological boundaries in the Indian subcontinent, Option 3, which states that "A, B and C are correct," is the only logically sound and factually accurate answer.

**Why other options are incorrect:**

*   **Option 1: Only A and B are correct.** This is incorrect because statement C is also correct. The Great Boundary Fault does indeed separate the Aravalli and Vindhyan systems.

*   **Option 2: Only B and C are correct.** This is incorrect because statement A is also correct. The Main Central Thrust does indeed separate the Greater and Lesser Himalayas.

*   **Option 4: Only A and C are correct.** This is incorrect because statement B is also correct. The Main Boundary Fault does indeed separate the Lesser Himalaya and the Shiwaliks.

In conclusion, only Option 3 accurately reflects the factual correctness of all three statements regarding the major geological boundaries defined by the Main Central Thrust, Main Boundary Fault, and Great Boundary Fault. Therefore, Option 3 is the correct answer.