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# Earthquakes!

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### Earthquakes!

1. 1. Earthquakes!<br />8SCIENCE Tues. April 5<br />
2. 2. What is an earthquake?<br />Review:<br />Sections of the Earth’s crust (plates) move and cause rocks to bend and stretch <br />If there is enough force the rocks will break, release energy and cause vibrations <br /> = earthquake<br />
3. 3. Where are these plates found?<br />These plates are made of Earth’s crust <br />Review layers of the Earth: animation<br />Crust<br />Mantle <br />Outer core<br />Inner core<br />
4. 4. What is an earthquake?<br />Earth’s crust is in constant motion because of forces inside the earth <br />These cause sections of the crust (plates) to move which puts force on the plates<br />3 types of force:<br />Compression<br />Tension<br />Shear<br />
5. 5. Forces form faults<br />Compression = force that pushes together  <br />Tension = force that pulls apart  <br />Shear = force that moves past the other ↑↓<br />These forces cause rocks to break and move along surfaces called faults<br />
6. 6. Different Forces produce Different Faults<br />To see the above in motion:<br />When rocks are stretched they may break and an earthquake will result<br />When they break, energy is released along fault surfaces, also called an earthquake!<br />