Internal Processes / Volcanism & Plutonic Landforms - Subduction

Subduction & Accretion

  • denser oceanic crust
  • lighter continental crust
  • subduction forces densest material down
    • South American Andes


Subduction Profile:

  • scraping sea-floor sediment into trench
  • melting in Asthenosphere
  • magma rises to surface
  • sub-surface (plutonic) features
  • volcanic chains
  • island arcs


Accretion

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