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Mountains PowerPoint Presentation

Mountains

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Mountains

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Presentation Transcript

  1. Mountains

  2. First, some interesting vocabulary

  3. Mountain • Mountain – An individual chunk of rock or rocks of great height. • Example: Pikes Peak, Colorado

  4. Mountain Range • Mountain range – A series of mountains formed about the same time in a similar fashion and with similar composition • Example: Front Range of Rockies

  5. The Front Range

  6. Mountain System • Mountain system – A series of mountain ranges located in the same area • Example: Rocky Mountains

  7. The Rocky Mountain System • Contains dozens of mountain ranges!

  8. Mountain Belt • Mountain belt – Multiple mountain systems that run along the edges of continents • Example - The American Cordillera: Rocky Mountains, Pacific Mountains, the Andes Mountains, and others

  9. A Closer Look

  10. Coincidence that it’s an active boundary and near a subduction zone?

  11. A Neat Word Orogeny – The process by which mountains are created 3 Main Ways to Make Mountains • Volcanoes • Faulting • Folding

  12. 1. Volcanoes • Been there, done that. Nuff said.

  13. 2. Fault-Block Mountains • As Earth’s crust is uplifted (by various means), it eventually cracks and breaks into large blocks • Some blocks are pushed up, others are pushed down • Result: Mountains!

  14. Example of Fault Mountains:The Grand Teton Mountains, Wyoming

  15. How The Tetons Formed

  16. 3. Fold Mountains • Crust is “squeezed” from two directions • Rock folds and bends

  17. Example of Fold Mountains:The Alps

  18. Under Pressure • Formed when African plate rammed into Eurasian plate

  19. Mountains Grow… And Then They Shrink Appalachian Mountains ~ 300 million years old (formed during formation of Pangaea!) And now steadily eroding… Rocky Mountains ~ 100 million years old And Still Growing

  20. Another Factoid:Continents Grow! • “Gobble up” smaller “subcontinents” • Collisions also create coastal mountains, such as the Pacific Range • Accumulate “scrapings” of subducted ocean plate Example: West Coast of North America

  21. Accretion in Action