What is an Earthquake and how it occurs?
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Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. They don't just slide smoothly; the rocks catch on each other. The rocks are still pushing against each other, but not moving. After a while, the rocks break because of all the pressure that's built up. When the rocks break, the earthquake occurs. During the earthquake and afterward, the plates or blocks of rock start moving, and they continue to move until they get stuck again. The spot underground where the rock breaks is called the focus of the earthquake. The place right above the focus (on top of the ground) is called the epicenter of the earthquake.
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Definition: Earthquake is one of the most dangerous natural hazards where the earth surface starts shaking and the amount of shake is dependent on the intensity of the earthquake.
Causes:
The main cause of the earthquake is the movement of the tectonic plates which are situated under the surface of the earth in a floating condition.
When,two or more floating tectonic plates get on each other,then the displacement happens and as a final result the earthquake happens on the surface of our planet.
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