Key facts

  • Lithospheric plates move over the asthenosphere; they are not continents floating on liquid magma.
  • Divergent margins create crust, convergent margins destroy or thicken it, and transform margins conserve crust.
  • Magnitude measures earthquake energy; intensity measures observed effects at a place.
  • India's current seismic reference remains IS 1893 Part 1:2016 after the 2026 withdrawal of revised zonation.
  • Barren Island is India's historically active volcano in the Andaman arc; Deccan Traps are flood basalts.

Key Points at a Glance

  1. 1

    Lithospheric plates move over the asthenosphere; they are not continents floating on liquid magma.

  2. 2

    Divergent margins create crust, convergent margins destroy or thicken it, and transform margins conserve crust.

  3. 3

    Magnitude measures earthquake energy; intensity measures observed effects at a place.

  4. 4

    India's current seismic reference remains IS 1893 Part 1:2016 after the 2026 withdrawal of revised zonation.

  5. 5

    Barren Island is India's historically active volcano in the Andaman arc; Deccan Traps are flood basalts.

  6. 6

    Weathering alters rock in place; erosion removes and transports weathered or loose material.

  7. 7

    Fluvial, glacial, aeolian and karst agents produce distinct but often overlapping landform suites.

  8. 8

    Rock type, structure, climate and base level control which landform a process finally produces.

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What geomorphology asks in Prelims

  • Core idea: Geomorphology studies landforms, the materials that compose them, and the processes that build, wear down, move and deposit those materials. For UPSC, the question is rarely only definitional; it usually links a process with a landform, a plate margin, a rock type or an Indian example.
  • Two process families: Endogenic forces originate within the earth and create relief through diastrophism, plate movement, earthquakes and volcanism. Exogenic forces work at or near the surface through weathering, mass wasting, erosion, transportation and deposition.
  • Scale trap: A fold mountain, a rift valley, an oceanic trench and a volcanic island arc are first-order tectonic outcomes; a meander, drumlin, dune or stalactite is a smaller landform created by surface agents.
  • Material-process link: Rocks are not passive background. Igneous rocks often mark cooling magma or lava; sedimentary rocks record deposition and compaction; metamorphic rocks show heat, pressure and chemically active fluids. Their resistance, joints and bedding influence how rivers, glaciers, wind and groundwater carve them.
  • India link: The Himalaya reflects the India-Eurasia collision; the Deccan Traps record large basaltic volcanism near the end of the Cretaceous; the Narmada-Son rift belt and Kachchh show intraplate tectonic significance; Andaman-Nicobar belongs to an island-arc setting linked with subduction east of the Indian Plate.
  • Prelims habit: Always ask four questions: source of energy, type of movement, dominant agent, and likely landform. That one checklist separates plate-boundary features from erosional and depositional features.
  • Contemporary hook: Disaster and infrastructure questions now combine geomorphology with hazard mapping. PIB stated in 2026 that IS 1893 Part 1:2016 remains the current Indian seismic standard after the revised zonation was withdrawn in March 2026; this makes the old Zone II-V framework still relevant for MCQs.
  • Boundary of this note: The focus is Physical Geography, but social and economic relevance appears through seismic risk, volcano monitoring, landslides, coastal settlement, groundwater in karst, river management and infrastructure location.
  • Question framing: UPSC often hides geomorphology inside paired statements such as 'all young fold mountains are volcanic' or 'all plate boundaries are narrow'. Read qualifiers carefully: most, generally, only and always decide the answer.
  • Order of causation: Interior heat and gravity produce tectonic relief; climate and surface agents then modify it. A correct answer should not reverse this order by making rivers responsible for creating the Himalayan belt itself.

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PredictedPredicted Questions

Use these prompts to test answer structure before moving to practice.

1MCQConsider the following statements about plate boundaries: 1. New oceanic crust is generally created at divergent margins. 2. Continental-continental convergence generally produces deep ocean trenches and volcanic island arcs. 3. Transform margins are commonly associated with shallow earthquakes. Which of the statements is/are correct?1 marks · 50 words
  1. A1 and 2 only
  2. B1 and 3 onlyCorrect
  3. C2 and 3 only
  4. D1, 2 and 3

Explanation

Statement 1 is correct. Statement 2 is incorrect because continental collision mainly thickens crust and forms fold mountains. Statement 3 is correct.

~50 words · 1 marks