GS1 › Geophysical Phenomena and Resource Distribution

Revision note: Volcanoes and Volcanic Landforms

  • Magma (below) vs lava (surface); source asthenosphere
  • Locations: subduction (explosive), divergent (gentle), hotspots; ~75% in Ring of Fire
  • Forms: shield (Mauna Loa), composite (Fuji, Vesuvius), cinder (Parícutin), caldera (Toba, Yellowstone), flood basalt (Deccan)
  • Intrusive: batholith, laccolith, lopolith, phacolith, sill (horizontal), dyke (vertical)
  • Pyroclastic flows deadliest; lahars; Pinatubo cooled ~0.5°C
  • India: Barren Island active; Narcondam dormant; Deccan Traps ~66 Ma; Puga geothermal
Revision card summarising Volcanoes and Volcanic Landforms
One-page visual summary of the key points to revise.

Source: https://upscprep.in/upsc/gs1/geophysical-phenomena-and-resource-distribution/volcanoes-and-volcanic-landforms/ · UPSCPrep.in

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