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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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    Earthquake!! Earthquake!! Presentation Transcript

    • Earthquake!!
      Year Four
    • 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
    • What did you see happening in the animation?
    • 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
    • Now lets watch it again……
    • Australian Earthquakes?
      Where do you think the most earthquakes would occur?
      Do we get earthquakes in Australia?
    • The Layers of the Earth
      Does anyone know any of the names of the layers of the Earth?
    • 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
    • The Outer Core
      Liquid layer which is 2200km thick
      Temperature approximately 5000 degrees
      Made up of hot, molten lava
      notes! Mantle
    • 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
    • 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
    • Blanket Activity
      Two helpers needed
      Each to push the ends of the blanket towards each other
      What happens?
      What is this representing?
    • A bridge across a tectonic plate that has divided
      How did this happen?
    • How?
      So how does an earthquake happen?
      Using all of this new knowledge – you tell me!
    • 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!
    • 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
    • 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!
    • Richter Scale
      Earthquake strength is classified on the Richter Scale
    • Guess the Magnitude
    • Guess the Magnitude
    • Guess the Magnitude
    • 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
    • Questions?
      Check the question chart – have we answered everything?