How earthquakes happen.
Earthquakes happen because there are tectonic plates under the earth. These plates rub together once in a while creating Seismic waves which travel around the area which the tectonic plates are placed. The plates can rub together three different ways. One way is divergent plates, when this happens the plates are moving away from each other. The second way is transform plates,this is when the plates rub together. The other way is convergent plates which are when the plates move towards each other.