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A presentation that I used to introduce my year four students to the topic of earthquakes.

A presentation that I used to introduce my year four students to the topic of earthquakes.

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  • 1. Earthquake!!
    Year Four
  • 2. Today’s Lesson
    What you will learn:
    The structure of the Earth
    What this has to do with earthquakes
    How and why earthquakes form
    How earthquakes move
    How an earthquake damages land and structures
    How earthquakes are measured
  • 3. What did you see happening in the animation?
  • 4. Tectonic Plates
    Tectonic plates form part of one of the earth’s layers.
    They are like pieces of a jigsaw
    They are constantly being pushed around, bumping and grinding into each other - when this happens, an earthquake usually occurs
    Tectonic plates move continents at approx 50-100mm each year
  • 5. Now lets watch it again……
  • 6. Australian Earthquakes?
    Where do you think the most earthquakes would occur?
    Do we get earthquakes in Australia?
  • 7. The Layers of the Earth
    Does anyone know any of the names of the layers of the Earth?
  • 8. The Inner Core
    Hottest part of the Earth
    Possibly as hot as the Sun
    Solid sphere 2500km across – the distance from Sydney to Cairns!
    notes! Outer Core
  • 9. The Outer Core
    Liquid layer which is 2200km thick
    Temperature approximately 5000 degrees
    Made up of hot, molten lava
    notes! Mantle
  • 10. The Lower and Upper Mantle Lithosphere
    Lower – made from solid rock
    Upper - also known as the lithosphere
    200km thick
    Broken into the tectonic plates – oceanic and continental
    notes! Crust
  • 11. The Crust
    25km of loose rock
    Makes up less than 1% of the Earth
    We live on the top of the crust
    This is the part of the Earth that gets broken and split in an earthquake
  • 12. Blanket Activity
    Two helpers needed
    Each to push the ends of the blanket towards each other
    What happens?
    What is this representing?
  • 13. A bridge across a tectonic plate that has divided
    How did this happen?
  • 14. How?
    So how does an earthquake happen?
    Using all of this new knowledge – you tell me!
  • 15. Faults
    Fault- an area or line along a tectonic plate that the released energy from an earthquake travels along. The earth’s crust is pushed up or down, or over or under when this happens, creating different size faults – like scars on rock or even mountains!
  • 16. Focus and Epicenter
    The underground starting point of the earthquake is called the focus
    The above ground starting point of an earthquake is called the epicentre
  • 17. Seismic Waves
    Waves of force that start from the focus and travel outwards
    There are primary (p-waves) and secondary waves (s-waves)
    p-waves occur first, then s-waves
    Seismic waves are what causes the shaking and splitting of the earth
    Watch this animation to see how they can travel ALL over the world!
  • 18. Richter Scale
    Earthquake strength is classified on the Richter Scale
  • 19. Guess the Magnitude
  • 20. Guess the Magnitude
  • 21. Guess the Magnitude
  • 22. 2004 Earthquake
    On Boxing Day, 2004, a 9.3 earthquake occurred along Sumartra’s west coast
    This was one of the deadliest natural disasters of all time – but not because of the earthquake
    The focus was on an oceanic tectonic plate, which caused a deadly tsunami that hit Indonesia, Sri Lanka, India and Thailand the hardest
  • 23. Questions?
    Check the question chart – have we answered everything?