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# L4 ap earthquakes

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### L4 ap earthquakes

1. 1. What are earthquakes and how are they formed? Video here What are earthquakes and how are they formed?
2. 2. What are earthquakes and where do they occur? They can occur at all 4 major plate boundaries but the most severe earthquakes are normally found at CONSERVATIVE and DESTRUCTIVE boundaries. CONSERVATIVE DESTRUCTIVE
3. 3. Your Turn! _____________ are caused when two _________ moving past each other become ‘stuck’ for a while, so ______ builds up. Eventually the stress becomes so great that the ______ breaks and moves suddenly. The point where the ______ actually breaks is called the _______ , which is __________________. The point on the surface directly above the focus is called the ________ . When plates move suddenly ________ waves are sent out which can cause a lot of _________. epicentre tension focus shock plates underground crust damage Earthquakes rock
4. 4. How can we measure earthquakes? Earthquakes are measured using the Richter Scale. This measures the magnitude of a tremor (how powerful it is) using an instrument called a seismograph. Although the Richter Scale has no upper limit, the largest known shocks have had magnitudes in the 8.8 to 8.9 range. It is a logarithmic scale which means that a size ‘6’ on the Richter Scale is 10 times larger than a size ’5’ and 100 times larger than a size ‘4’. What are earthquakes and how are they formed?
5. 5. What are earthquakes and how are they formed?
6. 6. A seismograph What are earthquakes and how are they formed?
7. 7. TASK • In pairs complete a story board for a BBC documentary showing how earthquakes occur. • Sketch out what would be in 8 of the different scenes from your programme, include a written description of what is happening. What are earthquakes and how are they formed? http://www.bbc.co.uk/bitesize/ks3/geography/ physical_processes/plate_tectonics/activity/