1. Seismic Waves By Genevieve

2. Introduction Scientist study earthquakes to know more about the earth. To study earthquakes scientist use seismographs. Seismographs measures the the movement and vibration of earthquakes. It also tells what kind of seismic wave it is. Seismic waves are vibrations caused by rocks moving or breaking along faults. Seismographs make seismograms. On the seismogram the first small lines are p waves.

3. Fault

4. This is a seismogram You can see how the p waves are the smallest on the seismogram

5. Primary Waves Primary waves are also known as p waves. Primary waves are the first to arrive at a distance point. These waves are the fastest. They travel through solids liquids and gases.

6. Secondary Waves Secondary Waves are also known as S waves. These waves travel through solids only. S waves are slower then primary waves. Secondary waves arrive at a distance point.

7. Surface Waves Surface waves are also known as L waves or long waves. These waves are the slowest waves of all, but they cause the most damage. Surface waves are felt at the surface.

8. Introduction There are four layers of the Earth. They are the crust, mantle, outer core and inner core.

9. Crust We live on the crust! It is Earth's outer most layer. The crust is the thinnest layer. It is solid rock. It is deeper under continents than oceans.

10. Mantle The mantle is a layer of crust that lies below the crust. The thickest layer is the mantle. This layer allows tectonic plates to slowly move. Rocks move or flow due to pressure and high temperatures.

11. Outer core The outer core is made of melted iron, so it is totally liquid. The inner core flows in this layer.

12. Inner core The inner core is a solid sphere. It is in the center of the earth. This layer spins at a different rate than the rest of the Earth.

13. Hope you learned a LOT!!! THE END