Internal Processes / Volcanism & Plutonic Landforms - Plate Tectonics
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
build up of "exotic terranes" along plate
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