The Origin and Evolution of the Earth · Class 11 Geography · Chapter 2
🌍 The Origin and Evolution of the Earth
CBSE Class 11 Humanities & Commerce · Geography · Chapter 1
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📖Notes Deck
Full lecture deck with teaching paragraphs, misconception red-boxes, and glossary. Read this first.
Download PDF →📝Quick Drill
15 pattern-tagged MCQs with per-Q time budget. Drill under a 20-min timer.
Download PDF →📄Exam Paper
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Download PDF →👨👩👧For Parents
1-page plain-language parent guide: what's being learned + questions to ask your child.
Download PDF →Top question patterns · CBSE annual / SQP aggregate
| 80% | Explain the Big Bang (expanding-universe) theory with its evidence — State theory + ~13.7 bya → stages (tiny dense ball → expansion → cooling → galaxies) → Hubble evidence → conclusion. | 5 MARKS |
| 75% | Three stages in the evolution of the atmosphere — Stage 1 primordial H+He lost; Stage 2 degassing (volcanoes, CO2/N2); Stage 3 photosynthesis adds O2. Use the word 'degassing'. | 3 MARKS |
| 70% | Terrestrial vs jovian planets + reason for the difference — Inner = rocky/small (formed near hot sun, gases swept away); outer = gaseous/large (cold outer nebula held light gases). | 3 MARKS |
| 60% | Early theories (Kant / Laplace / planetesimal / tidal) + founders — Kant gaseous (1755), Laplace nebular (1796), Chamberlin-Moulton planetesimal, Jeans & Jeffreys tidal. Never reverse Kant and Laplace. | 3 MARKS |
| 60% | Differentiation and the layered earth (core-mantle-crust) — Homogeneous hot earth → heat (impacts+compression+radioactivity) → iron/nickel sink (core), light rises (mantle/crust) = differentiation. | 5 MARKS |
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