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5.1Movement of Rock Builds Mountains
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5.1Movement of Rock Builds Mountains

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  • 1. Movement of Rock Builds Mountains Pages 137-144 (section B)
  • 2. MOST MOUNTAINS FORM ALONG PLATE BOUNDARIES
    • A shallow sea once covered Mt. Everest
      • Rocks containing remains of ocean animals found there.
      • Rocks formed at a far away spreading center also found there.
  • 3. What is a Mountain?
    • Mountain - an area of land that rises steeply from the land around it.
      • A single mountain is rare.
  • 4. MOUNTAIN RANGES Mountain Range - long line of mountains formed at about the same time by the same processes
  • 5. MOUNTAIN BELTS
    • Mountain Belt - ranges that are close together.
      • Most major mountain belts are located along tectonic plate boundaries
      • Some, like the Appalachians, are on the interior of the plates
      • These were formed by ancient plate collisions that formed the continents
  • 6. MOUNTAINS, ROCKS, AND SEDIMENT
    • On the surface, water and wind break rocks apart and move the pieces away.
    • As long as mountains are pushed up faster than they wear down, they grow taller.
  • 7. Mountains over Time
    • Young mountains are tall and steep.
    • Eventually water and wind take over, and over time the mountains become rounded hills.
  • 8. Mountains over Time
    • The land becomes flatter as mountains wear down and valleys are filled with sediments.
    • If tectonic plates stopped moving, eventually the surfaces of the continents would be completely flat.
  • 9. MOUNTAINS CAN FORM AS ROCKS FOLD
    • Tectonic plates move only a few cm a year.
    • Edges of a continent along a convergent boundary are subjected to high amounts of stress over very long periods of time.
    • Some rocks break, some fold.
  • 10. FOLDED MOUNTAINS
    • Folded Mountains - mountains formed when continental crust crumples and bends into folds.
      • Form as an oceanic plate sinks under the edge of a continent or as continents collide.
  • 11. Himalaya Mountain Forming Process
    • The Himalaya belt formed by a collision between India and Eurasia
    • 1. A convergent boundary develops.
    • 2. Continental collision begins.
    • 3. Collision continues.
  • 12. MOUNTAINS CAN FORM AS ROCKS MOVE ALONG FAULTS
    • Fault-Block Mountains - form as blocks of rock move up or down along a normal fault.
      • Forces within the Earth cause the lithosphere to stretch and pull apart.
      • Cold, rigid rocks in the crust break into large blocks.
      • As stretching continues, the blocks of rock move along the faults that separate them
  • 13. Fault-Block Mountain Range Formation
    • The Sierra Nevada in California is a fault-block mountain range
    • 1. The range moved up along a normal fault on its eastern edge.
    • 2. The block on the other side dropped down.
    • 3. The eastern side of the range is steep. The western side tilts down gently toward California’s Central Valley.
  • 14.
    • http://www.pond5.com/stock-footage/909732/mountain-formation.html

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