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
http://www.ehow.com/info_8737831_causes-tsunamis-e...
Actually, there are may reasons for earthquakes so there is no definite causes, but there are reasons. 1 Plates siding against each other. 2 Plated moving under another plate (subducton
http://wiki.answers.com/Q/What_causes_earthquakes_...
Plate tectonics A simplified answer: The release of pressure caused by the grinding together of the tectonic plates. Imagine the Earth's outer layer as being cracked into many pieces
http://wiki.answers.com/Q/What_are_the_causes_of_a...
the plates at the bottom of the earth banged together
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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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