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Geography

Which geological outcome occurs when a mantle plume interacts with thick continental lithosphere?

A)Rift valley formation with flood basalts
B)Deep ocean trench and island arc
C)Glacial isostatic rebound
D)Formation of strike-slip fault zones

💡 Explanation

When a mantle plume interacts with the lithosphere, thermal weakening occurs because the plume generates heat, promoting decompression melting and extensive volcanism that leads to rifting. Therefore rift valleys and flood basalts develop, rather than oceanic trenches or rebound which require totally different tectonic settings.

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