The formation of the Deccan Trap is mainly related to what?

Correct answer: Volcanic lava flow

Direct answer: Option B, volcanic lava flow. The Deccan Trap is a vast region of step-like basalt layers in peninsular India. It formed mainly when very large quantities of fluid basaltic lava spread over the land through ancient fissure eruptions. Repeated flows cooled into layers, and later erosion helped expose the stair-like or trap-like appearance. Option A, river silt, forms alluvial plains and deposits, not the thick basalt sheets of the Deccan Trap. Option C, marine coral, forms carbonate reefs in shallow seas and does not explain this volcanic plateau. Option D, glacial ice, shapes landscapes by erosion and deposition in cold regions, but it did not create the Deccan basalt layers. The key chain is: fissure eruptions → extensive lava sheets → cooling into basalt layers → step-like plateau. Memory cue: Deccan Trap means ancient lava and basalt steps.