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Geography

Which outcome occurs when tectonic subduction stalls during collision?

A)Crustal thickening and mountain building
B)Increased frequency of deep earthquakes
C)Formation of a mid-ocean ridge
D)Volcanic activity ceases entirely

💡 Explanation

The primary outcome is crustal compression via isostatic response/adjustment; this leads to crustal thickening because continued convergence stress cannot be relieved. The mechanism of collision orogeny therefore forms mountains, rather than allowing subduction to continue.

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