Live Quiz Arena
🎁 1 Free Round Daily
⚡ Enter ArenaQuestion
← GeographyWhich outcome is enhanced along subduction zones by water introduction?
A)Magma generation triggering explosive volcanism✓
B)Crustal thickening inhibiting magma ascent
C)Isostatic rebound causing reduced melting
D)Trench formation decreasing vent explosivity
💡 Explanation
Magma generation increases during subduction because the **lowering of the mantle's melting point** occurs with the introduction of water from the subducting plate; therefore explosive volcanism appears rather than purely effusive, if water is not introduced.
🏆 Up to £1,000 monthly prize pool
Ready for the live challenge? Join the next global round now.
*Terms apply. Skill-based competition.
Related Questions
Browse Geography →- Which risk increases when vegetation removal occurs in ventifact fields?
- Which consequence results when rapid tectonic uplift occurs?
- Which landform develops when freeze-thaw cycles and permafrost cause creeping downslope movement of saturated soil?
- Which consequence results when a pyroclastic surge encounters standing water?
- Which outcome characterizes regions during accelerated limestone chemical weathering?
- Which mechanism amplifies volcanic explosivity when magma ascending through a subduction zone encounters groundwater near the surface?
