Earths structure


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Earths structure

  1. 1. Let the Fun Begin!
  2. 2. A short video Clip AGY1dmE&feature=related
  3. 3. 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.
  4. 4.  Temperature – increases as you descend  Pressure (force pushing on a surface area)- the deeper you go the greater the pressure.
  5. 5. 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
  6. 6. density the amount of mass in a given space
  7. 7.  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.
  8. 8.  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
  9. 9. 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.
  10. 10.  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.
  11. 11. 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?
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