1. Earthquakes
By Aaron A and Aaron w

2. How they happen
Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little.

3. Some amazing facts
Natural events such as volcanic eruptions and meteor impacts can cause earthquakes, but the majority of naturally-occurring earthquakes are triggered by movement of the earth's plates.

4. The earth's surface consists of 20 constantly moving plates
The earth's surface consists of 20 constantly moving plates. The pressure increase from shifting plates can cause the crust to break. This break allows stress to be released as energy, which moves through the earth in the form of waves

5. Normally, it's not the shaking ground itself that claims lives during an earthquake. It's the associated destruction of man-made structures and the instigation of other natural disasters such as tsunamis, avalanches and landslides. Not only is it important to have a plan for yourself in the case of an earthquake, but your pets need a disaster plan as well. Create an earthquake plan for the animals around so if disaster strikes, you’ll be prepared

6. Earthquakes involve the powerful movement of rocks
Scientists use the different speeds of seismic waves to locate the epicentre (the point on the surface directly above where the earthquake originated) of earthquakes

7. San Andreas fault system is more than 800 miles long and extends to depths of at least 10 miles within the Earth. In detail, the fault is a complex zone of crushed and broken rock from a few hundred feet to a mile wide.

8. Most earthquakes occur along fault lines
Most earthquakes occur along fault lines. The principle types of faults are: normal, reverse, thrust, and slip-strike. Normal faults form when two plates are under tension and are being pulled or stretched apart. When this occurs, Earth's crust thins and one plate rises or drops against the other.

10. Here is a video of a earthquake

11. The end
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