Earthquake
An earthquake is an unpredictable event in which masses of rock shift below the Earth's surface, releasing enormous amounts of energy and sending out shock waves which sometimes cause the ground to shake dramatically. Not all earthquakes cause calamity, but they are known to be one of the Earth's most destructive forces. Entire structures, including houses and dams, have been known to collapse in an earthquake.
Earthquakes occur along fault lines, which are boundaries of different layers, or plates, of rock masses on the crust and within the Earth. The movement of one immense plate can shift great masses of weight and pressure onto other weaker layers. When this pressure gives way, an earthquake can take place.
An earthquake's power can be measured in two ways: by intensity and magnitude. While intensity of a quake is usually described through people's perceptions and the severity of building destruction, magnitude is measured by using seismographs or devices which......

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Title: Earthquake
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1. Earthquake
   

   Earthquake. Earthquake ... happen. An earthquake is the trembling of the earth's surface
   caused by rapid movement of the earth's rocky outer layer. ... ...

2. Loma Prieta Earthquake
   

   Loma Prieta Earthquake. On October 17, 1989 at approximately 5:04 PM, a 7.1
   magnitude earthquake shook the Oakland and San Francisco areas. ... ...

3. My Earthquake Experience
   

   My Earthquake Experience. The terrible earthquake happened in the afternoon on May
   12, 2008 when I was about to library. Suddenly I felt the floor shaking. ... ...

4. The Great Alaska Earthquake
   

   The Great Alaska Earthquake. March 27, 1964 a magnitude 9.2 earthquake hit Alaska
   its epicenter located in Prince William Sound, 75 miles east of Anchorage. ... ...

5. Earthquake
   

   Earthquake. An earthquake is the result of a sudden release of energy in
   the Earth's crust that creates seismic waves. Earthquakes ... ...