What Causes a Earthquake?

Answer

An earthquake is described as a sudden movement or tremor of the crust of the earth which originates from under or on top of the surface. The two major causes of earthquakes are explosive volcanic eruptions and tectonic activities related to plate faults and margins.
Q&A Related to "What Causes a Earthquake"
Tectonic plates are the moving pieces of Earth's crust and outer mantle, which cover the entire planet. These plates are in constant, slow motion, and sometimes bump and slide past
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The processes of "plate tectonics" are what cause an earthquake. An answer for young students. : Earthquakes are shakes and jiggles in the huge pieces of the Earth that
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Earthquakes are caused by the movement of tectonic plates under the Earth's surface. When these plates move and overlap each other then a lot of moovement is produced which results
http://wiki.answers.com/Q/An+earthquake+causes+a+t...
The tectonic plates crash together and the weaker one goes underneath causing the stronger to be pushed up to form these volcanoes. Earthquakes are the first stage of this process.
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2 Additional Answers
Ask.com Answer for: what causes a earthquake
Earthquakes are caused by an abrupt shift of rock along a fracture in the Earth.
Most earthquakes are caused by slow movements inside the Earth that push against the Earth's brittle, relatively thin outer layer, causing the rocks to break suddenly.
The movement of two of the Earth's plates, or layers, is what causes an earthquake. The two plates move and either run into each other or slide past each other. You can find more information here: http://earthquake.usgs.gov/learn/kids/eqscience.php
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