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    Instrusive Features Instrusive Features Presentation Transcript

    • PHYSICAL GEOGRAPHY FIFTH FORM ROOM ONE
    • THE RICTHER SCALE
      • The Richter Scale is the best known scale for measuring the magnitude of earthquakes.
      • A seismograph is the device that scientists use to measure the intensity of earthquakes.
    • Richter scale no. Typical effects of this magnitude
      • 3.4 Detected only by seismometers3.5 - 4.2 Just about noticeable indoors
      • 4.3 - 4.8 Most people notice them, windows rattle.
      • 4.9 - 5.4 Everyone notices them, dishes may break, open doors swing.
      • 5.5 - 6.1 Slight damage to buildings, plaster cracks, bricks fall.
      • 6.2  6. Much damage to buildings: chimneys fall, houses move on foundations.
      • 7.0 - 7.3 Serious damage: bridges twist, walls fracture, buildings may collapse.
      • 7.4 - 7.9 Great damage, most buildings collapse.
      • 8.0 Total damage, surface waves seen, objects thrown in the air.
    • seismograph
      • Folding happens when two pieces of a plate come together and push against each
      • The high points of the ripples are called anticlines. The low points of the ripples are synclines.
    •  
    • TYPES OF FOLDING
    •  
    •  
    • Faulting
      • Faults in a plate are usually parallel to each other. They run up and down the plate in an area called a fault zone. Many people in the United States think of California when they think of faults. That's because areas with a lot of faults have a lot of earthquakes. In reality, there are faults all over North America, not just in California. Those fault zones may only be a few inches long or they can travel for miles without ending. There are two big types of faults: dip slips and strike slips .
      • Strike Slips
      • A strike slip happens when two pieces of land move horizontally (side to side) to each other. That movement would be left or right compared to the other piece. We talked about California before. The San Andreas Fault in California is an example of a large strike slip. It is the point where the Pacific Plate and the North American Plate move against each other.
    •  
      • Dip Slips
      • A dip slip is when two pieces of land change their vertical (up and down) position compared to each other. After the movement, one side is higher than the other side.
    •  
    • Some intrusive igneous structures
    • BATHOLITHS
    • A composite volcano
    • A size comparison of the three types of volcanoes
    • Mt. St. Helens – a typical composite volcano
    • SHIELD VOLCANO
    • ASH AND CINDER
      • Silica-rich lava hardens before flowing far, forming a dense-texture rock of tiny crystals or glass . Basic lava flows further before it solidifies, giving rise to coarse-grained igneous rock, such as granite or gabbro . In many eruptions, lava is ejected with such force that it fragments in the atmosphere, hardens while airborne, and lands to form thick layers of volcanic tuff and related pyroclastic rock.
      • http://www.physicalgeography.net/fundamentals/10l.html
      http://www.youtube.com/watch?v=scGvM_VoPwk&feature=related http://www.youtube.com/watch?v=E1Uvr8dUDHQ http://www.youtube.com/watch?v=4Y-62Ti5_6s http://www.youtube.com/watch?v=j9JDzBTwiig KILLER TSAMI