Orogeny and Other Types of Mountain Building

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Chapter 20.2 and 20.3

• Orogeny and Other Types of Mountain Building

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orogeny and compressive forces

• Orogeny All Processes that form mountain ranges
• Compressive forces processes that squeeze the
  crust and cause intense deformation in the form
  of folding, faulting and metamorphism

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Convergence

• Oceanic-oceanic convergence one plate is
  subducted and the other has magma forced upward
  which forms an island arc
• Oceanic-continental convergence oceanic plate
  descends and the continental plate is forced
  upward forming a mountain belt
• Continental-continental convergence both
  continental crusts become highly folded the
  magma that results solidifies beneath the Earths
  surface continental crust cannot subduct into
  the mantle because of its low density

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Guess which type of mountain is the tallest?

• 1 continental-continental convergence
• 2 oceanic-continental convergence
• 3 oceanic-oceanic convergence

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20.3 Other Types of Mountains

• Divergent-Boundary Mountains Underneath the
  oceans floor, volcanic mountains form a
  continuous chain that snakes along the Earths
  ocean floor

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Uplifted Mountains

• When a region of the Earth is forced upward as a
  unit
• The reasons for large scale uplift are not well
  known
• A plateau may form when a region as a whole is
  uplifted
• The Sierra Nevadas and the Adirondack Mountains
  are both examples of uplifted mountains

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Fault-Block Mountain

• Land movement at a fault lifts land on one side
  of the fault and drops it on the other