Seismology
Seismology is a study of earthquakes and seismic waves in the internal spread of knowledge, but also to study other phenomena caused by the earthquake, such as the tsunami, and will cause the phenomenon of earthquakes, such as plate movement, volcanic movement. Earthquakes can cause seismic waves within the Earth, and by observing the conduction of seismic waves inside the Earth, one can understand and deduce the structure and structure of the interior of the earth. One of the earliest conclusions of the study of seismic waves is that the interior of the earth is liquid: the longitudinal wave can pass through the core, the shear wave can not pass through the core, and the propagation of the shear wave requires a relatively hard medium. Now scientists know that the different depth of the Earth's state is different, the core can be divided into solid core and liquid nuclear, which are derived from the seismological study. ...