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Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
Inside the Earth Presentation with Audio File
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Inside the Earth Presentation with Audio File

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Transcript

  1. Inside Earth the
  2. This table was drawn onto an Activeinspire flipchart – students wrote their ideas into the first column on the IWB What have we LEARNT? What do we WANT to know? What do we KNOW?
  3. This table was drawn onto an Activeinspire flipchart – students wrote their ideas into the second column on the IWB What have we LEARNT? What do we WANT to know? What do we KNOW?
  4. <ul><li>Earth’s interior is composed of 4 layers: </li></ul><ul><li>3 solid and 1 liquid </li></ul><ul><li>1. Inner core </li></ul><ul><li>2. Outer core </li></ul><ul><li>3. Mantle </li></ul><ul><li>4. Crust </li></ul>Interior Layers
  5. <ul><li>Center of the earth - Deepest layer, 6250 km under the surface </li></ul><ul><li>Solid ball of an iron alloy (sulphur & nickle traces) </li></ul><ul><li>2400 km in diameter, high pressure, white hot like the sun - approx 6000ºC </li></ul>The Inner Core
  6. The Outer Core <ul><li>Above the inner core – shell of molten iron, 2300 km thick </li></ul><ul><li>Cooler than outer core – still approx 4500ºC </li></ul><ul><li>Mostly iron, plus sulphur & nickle </li></ul><ul><li>Creates earth’s magnetic field </li></ul>
  7. The Mantle <ul><li>Two layers upper mantle and lower mantel – 2900 km thick </li></ul><ul><li>Lies 750 km beneath surface </li></ul><ul><li>Made of rock so hot that it flows under pressure </li></ul><ul><li>Hot rock rises and cooler rock descends creating slow moving currents </li></ul>
  8. The Crust <ul><li>Outer layer on which we live – made of the lightest materials - rock, soil & seabed. </li></ul><ul><li>Thickness ranges from 8km beneath oceans to 40km beneath continents </li></ul><ul><li>Currents within mantle has broken crust into blocks – called ‘plates’ </li></ul><ul><li>Plates move very slowly and sometimes collide – forming mountains or drift apart forming seabed. </li></ul>
  9. <ul><li>Continents are relatively light blocks floating high on the upper mantle </li></ul><ul><li>Seafloor is made of ‘basalt,’ a denser rock that presses deeper into the mantle – produces basins </li></ul><ul><li>Scientists can’t take samples of inner layers </li></ul><ul><li>Scientists watch how seismic waves from earthquakes are bent, reflected, sped up or delayed by the interior layers </li></ul>
  10. Cross Section of the Earth
  11. Time for a quick video… ‘The Layers of the Earth Rap’ http:// www.youtube.com/watch?v =Q9j1xGaxYzY&feature=related

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