Which tectonic structural division of the Himalayas underlies the majority of Sikkim and is bounded by the Main Boundary Thrust to the south and the Main Central Thrust to the north?

💡 Solution & Explanation

The Lesser Himalaya, composed mainly of low-grade metamorphic and sedimentary rocks, occupies a major portion of Sikkim's geographical terrain and lies directly between the Main Boundary Thrust and the Main Central Thrust. The Siwalik hills form the outermost foothills further south, whereas the Higher Himalayas lie north of the Main Central Thrust. This rugged structural zone experiences intense seismic activity, frequent landslides, and steep slopes drained by fast-flowing tributaries of the Teesta River.