Fold Mountains and Ocean Trenches

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Fold Mountains

  • ·         These are large mountain ranges where layers of rock have been compressed together
  • ·         This can occur at both destructive and collisional plate boundaries (where two continental plates are forced together often with a shallow sea between them initially)
  • ·         They can form as either an anticline where rock folds upwards and can result in an over fold
  • ·         Or into a syncline where there’s a trough

Process

  • 1.       Sediments accumulate in shallow seas or where rivers enter an area (depression)
  • 2.       This creates a sea or lake of layered sediment as compression begins to take place
  • 3.       As the two plates move towards each other due to the convection currents in the mantle
  • 4.       This begins to crumple the rocks together
  • 5.       The rock starts to form folds which are pushed upwards as the plates collide further to form fold mountains
  • 6.       These mountains are then

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