Hi Jenny.I am fine. How are you. I am here to present the topic about the Earth quake.i know most of the Asian countries are much affected by it. An earthquake is sudden ground movement. This movement is caused by the sudden release of the energy stored
in rocks. An earthquake happens when so much stress builds up in the rocks that the rocks break. An earthquake’s
energy is transmitted by seismic waves. Each year, there are more than 150,000 earthquakes strong enough to be felt
by people. An amazing 900,000 are recorded by seismometers.
CHAPTER 7. MS EARTHQUAKES
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www.ck12.orgCauses of Earthquakes
Almost all earthquakes occur at plate boundaries. All types of plate boundaries have earthquakes. Convection
within the Earth causes the plates to move. As the plates move, stresses build. When the stresses build too much,
the rocks break. The break releases the energy that was stored in the rocks. The sudden release of energy creates
an earthquake. During an earthquake the rocks usually move several centimeters or rarely as much as a few meters.