An earthquake is the result of a sudden release of energy in the Earth's crust. An earthquake can also be called a 'quake' or 'tremor'.
Refer to the glossary at them bottom of this page if there are any words you don't know the meaning of.
Follow this link to a video and a quiz all about earthquakes.
Below you will find some keywords and definitions related to earthquakes.
More information can be found here.