Fold mountains

• Alphine - 35 million years ago
• Armorican - 250 million
• Caledonian - 400 million years
• Fold mountains formation.

  • When a heavier and a lighter plate collide, due to convection currents the heavier plate sinks underneath the lighter plate into the mantle.
  • The lighter plate then buckles upwards causing fold mountains to form
• Fold mountains 2.0

  • Magma (formed from the heavier plate melting into the mantle) can move to the surface, forming volcanoes. Example: The Andes formed by heavier Nazca Plate colliding with the lighter South American Plate
  • If two lighter plates collide, pressure causes both plates to buckle & fold upwards.

  Example: The Himalayas, where the Indo-Australian Plate collides with Eurasian Plate.
• fold mountains