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Earthquake

Earthquake is the movement of the earth's surface. It occur on two points: the point inside the Earth where an earthquake begins is called the focus. The point on the surface directly above the focus is called the epicentre.
Earthquakes can cause damage to buildings, bridges, and roads. Earthquakes, in fact, are a natural disasters and a cause of land pollution.
When an earthquake occurs in the sea, it can cause a tsunami. it is a giant tidal wave or series of waves.
The effects of the earthquakes are based on two scale: the Richter scale and the Mercalli scale.
The Richter scale is based on a mathematical study by Richter Charles. He was a pioneer in seismological research.

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