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Earthquakes

Earthquakes. Deformation. The process of when a rock changes because of stress Compression -rocks push together (squeezing) Tension -rocks pull away from each other (stretching)

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Earthquakes

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  1. Earthquakes

  2. Deformation • The process of when a rock changes because of stress • Compression-rocks push together (squeezing) • Tension-rocks pull away from each other (stretching) • Rock layers bend when stress is placed on them. But when the stress is placed on rocks, they can reach their elastic limit and break

  3. Compression- Plates push together Tension- Plates pull apart

  4. Folding • Bends in rock that are the result of heat and pressure • Occur when the pressure is not great enough to break the rock • Mountain form when tectonic plates collide

  5. Fault- A break in rock that is due to stress Three Types of Faults http://www.iris.edu/gifs/animations/faults.htm Normal Reverse Strike-Slip When rocks are pulled apart When rocks are pushed together When rocks are moved horizontally

  6. Seismology • The study of earthquakes • Seismologist-a scientist who studies earthquakes • Seismograph- used to record vibrations in earth and determine the strength of an earthquake • Seismogram- a tracing of earthquake motion • Earthquake-a sudden, violent shaking of the Earth caused by a shifting of the Earth’s crust

  7. Seismic Waves- a wave of energy that travels through the earth (also called Body Waves) P Waves S Waves Shear/Secondary Waves Second fastest Travel through solids Shear rock side to side as they travel through the rock • Pressure/Primary Waves • Fastest waves • Travel through liquid, solid or gas • Move rock back and forth which squeezes and stretches the rock http://www.classzone.com/books/earth_science/terc/content/visualizations/es1002/es1002page01.cfm

  8. Surface Waves • Move along the earth’s surface • Travel more slowly and are more destructive • Move the ground much like ocean waves move water particles

  9. Epicenter- the point on the earth’s surface directly above an earthquakes starting point • Focus-the point inside the Earth where an earthquake begins • Richter Scale- used to measure the strength of earthquakes

  10. Create a circle map about Earthquakes • Earthquake Causes • http://www.youtube.com/watch?v=P53OJd_lxew • Earthquake Destruction • http://www.youtube.com/watch?v=CtBXTvtFaCU • Study Jams: Earthquakes • http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-landforms/earthquakes.htm • Mr. Parr It’s An Earthquake • http://www.youtube.com/watch?v=sA6oZ4YgKCA

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