Earths structure
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Earths structure

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Earths structure Earths structure Presentation Transcript

  • Let the Fun Begin!
  • A short video Clip http://www.youtube.com/watch?v=ryrX AGY1dmE&feature=related
  • How do we know what it looks like?  Geologist record the seismic waves that earthquakes make and study how they travel through Earth.  The speed of these seismic waves and the path they take reveals how the planet is put together.
  •  Temperature – increases as you descend  Pressure (force pushing on a surface area)- the deeper you go the greater the pressure.
  • 1. Crusts  Layer of rock that forms Earth’s outer skin  Includes both the dry land (continental) and ocean floor (oceanic) Extra: Oceanic is DENSER so it sits BELOW the continental
  • density the amount of mass in a given space
  •  The deepest hole ever drilled into the continental crust was in the Kola Peninsula, in Russia.  It was 12,226 meters deep!  Because the temperature of the crust increases with depth, it is impossible to drill much deeper into the crust.
  •  2. Mantle  A layer of hot rock  The uppermost part of the mantle and the crust together form a rigid layer called the lithosphere  Temperature and pressure in the mantle increase with depth  Layer beneath the lithosphere that is less rigid then the rock above it is the asthenosphere. The material in this layer can flow slowly Extra: Sometimes it’s called the
  • 3. The core  Metal iron and nickel make up both parts of the core  Outer core is a layer of molten metal that surrounds the inner core (LIQUID)  Inner core is a dense ball of SOLID metal, where extreme pressure squeezes the atoms of iron and nickel so much that they cannot spread out and become a liquid.
  •  Currents in the liquid outer core force the solid inner core to spin at a slightly faster rate than the rest of the planet.  These currents in the outer core also create Earth’s magnetic field, which causes the planet to act like a giant bar magnet.
  • 1. What are the four main layers of the Earth? 2. What is the difference between the oceanic and continental crust? 3. What’s the difference between the inner and outer core?