Question:
The thickness of the continental crust in the Himalayan region is
The thickness of the continental crust in the Himalayan region is
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The Earth's crust varies in thickness. Oceanic crust is thin (about 5 to 10 km), while continental crust is much thicker, and it becomes thickest beneath high mountain ranges.
Updated On: Jun 16, 2026
- 5 km
- 15 km
- 30 km
- 70 km
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The Correct Option is D
Solution and Explanation
Concept:
The Earth's crust varies in thickness. Oceanic crust is thin (about 5 to 10 km), while continental crust is much thicker, and it becomes thickest beneath high mountain ranges.
Step 1:
Under tall mountains the crust has a deep root that extends downward to balance the height above, a principle known as isostasy. The Himalayas are the world's highest range, so they have an exceptionally deep crustal root.
Step 2:
Because of this thick root, the continental crust beneath the Himalayan region reaches about 70 km in thickness, far greater than the average continental thickness of around 30 to 40 km.
Answer: Option (4) — 70 km.
The Earth's crust varies in thickness. Oceanic crust is thin (about 5 to 10 km), while continental crust is much thicker, and it becomes thickest beneath high mountain ranges.
Step 1:
Under tall mountains the crust has a deep root that extends downward to balance the height above, a principle known as isostasy. The Himalayas are the world's highest range, so they have an exceptionally deep crustal root.
Step 2:
Because of this thick root, the continental crust beneath the Himalayan region reaches about 70 km in thickness, far greater than the average continental thickness of around 30 to 40 km.
Answer: Option (4) — 70 km.
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