Why Do Earthquakes Occur?

Answer

Earthquakes normally occur when rock underground abruptly breaks along a fault. Earthquakes can as well be triggered by certain explosions underground. Human factors such as quarrying can also be a common factor that leads to earthquakes.
Q&A Related to "Why Do Earthquakes Occur"
There are giant blocks of rock that are what make up the earth's crust which are moved by plate tectonics. These blocks of rock are bound to bump into one another at times and when
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Earthquakes occur in well-defined belts that correspond to active plate tectonic zones.
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Chemical reactions occur because different types of molecules interact with each other to create new substances. Many of these interactions happen naturally and are not man-made.
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Earthquakes are linked to the natural movement of the Earth's crust. Volcanoes and tectonic plate activity can shift the placement of areas in the Earth's crust, resulting in an earthquake
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2 Additional Answers
Ask.com Answer for: Why Do Earthquakes Occur
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.
Earthquakes occur when the rock underneath the surface of the Earth break or shift. This causes the surface to shake, sometimes very violently. You can find more information here: http://www.geo.mtu.edu/UPSeis/why.html
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