Which mechanism causes persistent volcanic island formation over a mantle plume?

💡 Explanation

When a tectonic plate moves over a mantle plume or hotspot, magma rises and erupts, forming a chain of volcanic islands because the plate's motion carries each successive volcano away from its magma source. Therefore plate movement across hotspot results, rather than isostatic adjustment, sediment buildup, or geyser uplift, which require different geological processes and do not produce linear island chains.

• Which mechanism explains the development of columnar basalt when lava cools?
• Which process primarily governs crustal deformation along oceanic transform fault boundaries?
• Which risk increases near transform plate margins during locked phases?
• Which mechanism causes relatively shallow sill depths at the mouth of many fjords?
• Which geomorphic consequence results when a river's sinuosity increases significantly near an oxbow lake formation?
• Which outcome occurs when rapid isostatic rebound exposes coastal alluvial deposits after deglaciation?