What Is Earthquake

What is an earthquake ?

Earthquake|Why Does The Earth Shake?|Earthquake Waves|Propagation of Earthquake Waves|Types of Earthquakes|Measuring Earthquakes|Effects of Earthquake

Earthquake|Why Does The Earth Shake?|Earthquake Waves|Propagation of Earthquake Waves|Types of Earthquakes|Measuring Earthquakes|Effects of Earthquake

Distribution Of Earthquake And Volcanoes

Seismometer : Earthquakes : : Thermometer : _?_