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Which process explains coastal land subsidence during eruptions forming volcanic domes?

A)Isostatic rebound from magma withdrawal
B)Glacial isostasy during dome formation
C)Tectonic uplift near the dome
D)Viscoelastic relaxation following magma extraction

💡 Explanation

Viscoelastic relaxation occurs because the earth slowly deforms after the magma chamber empties, leading to surface sinking around the dome rim; therefore, it dominates in regional subsidence rather than faster isostatic adjustments or local plate-driven uplift.

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