Earthquakes of California

                     

    http://earthquake.usgs.gov/learn/kids/eqscience.php 

An earthquake is what happens when two blocks of the earth suddenly past one another. Earthquakes mostly occur at the San Andrea’s Fault, they tend to produce large earthquakes. The movement of huge blocks of the earth’s crust- the Pacific and North American plates cause the earthquakes of California. There are Instruments called seismographs record earthquakes. The recording they make is called a seismogram. A short wiggly line that doesn’t wiggle very much  means a small earthquake, and a long wiggly line that wiggles a lot mean a large earthquake.