4 Geography · 4.1.2 Interior of the Earth and plate tectonics

4.1.2.1 Interior of the Earth: crust, mantle, core and discontinuities

The Earth is layered like an onion: a thin rocky crust, a thick solid but slowly flowing mantle, and an iron–nickel core whose outer part is liquid and inner part solid; we know this mostly from indirect evidence, above all seismic waves.

  • APPSC Group 1
  • Advanced level
  • 8 min read
  • Full course

Key terms

  • crust
  • mantle
  • core
  • lithosphere
  • asthenosphere
  • Moho
  • Gutenberg
  • Lehmann
  • Conrad
  • sial
  • sima
  • nife
  • gravity anomaly
  • Kola borehole
  • direct and indirect sources

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Mains writingMains writing
  5. Common trapsFoundation
  6. Quick revisionFoundation

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