An earth quake happens when tectonic plates build pressure against each other and one side pops out and creates an earth quake. The
Earth quakes can change the surface of the earth can change based on what level it is on the rich tor scale. The land can get completely demolished by an earth quake.
The rich tor scale categorizes earth quakes in there level of danger:1 2 3 4 5 6 7 8 and 9. 1 as the safest, and 9 as the worst. they can use the seismograph to identify the number on the Richter scale
It is important to know about volcanoes because you can be prepared for an eruption any time soon. you'll know what to do.
Earth quakes mostly occur at the San Andreas fault. At that area the fault line goes straight through the land end is extremely dangerous. That is were earth quakes mostly occur.
Tsunamis are similar to earth quakes because they are created by tectonic plates popping out of the earth's crust, but just under the water. After the crust breaks it creates a wave that goes through the whole ocean. when a tsunami happens, it destroys everything in its path.