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Extrusive volcanoes are not found in which one of the following

June 1, 2025 by rawan239

Extrusive volcanoes are not found in which one of the following mountains?

Alaska

Rocky

Andes

Himalayas

This question was previously asked in

UPSC CDS-1 – 2018

Download PDF Attempt Online

The correct answer is D) Himalayas.

Extrusive volcanoes are typically associated with plate boundaries involving subduction or rifting, where magma reaches the Earth’s surface. The Himalayas were formed by the collision of the Indian and Eurasian continental plates, a process that primarily leads to intense folding, faulting, and uplift, rather than the formation of extrusive volcanoes. While intrusive igneous activity (like granite formation) occurs deep within the crust in collisional zones, molten rock rarely erupts onto the surface.

The Andes (Nazca/South American plate subduction), Alaska (part of the Pacific Ring of Fire), and historically, the Rocky Mountains region (though less active now than regions on the Ring of Fire) are associated with tectonic settings where extrusive volcanic activity has occurred or can occur. The Himalayas represent a continent-continent collision boundary, which is less conducive to surface volcanism compared to ocean-continent or ocean-ocean subduction zones or rift zones.

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