ࡱ>  5 !"#$%&'()*+,-./012346789:Root Entry FYeM@SummaryInformation(DocumentSummaryInformation8 WordDocumentJ  Oh+'0( @ L Xdlt|Unit 1  guoyaxin Normal.dotxijijun5@rvɝ-@ZeMTMicrosoft Office Word ՜.+,D՜.+,t0   ( WWW.YlmF.CoM7 (\dlKSOProductBuildVer2052-10.1.0.58660TableData  P$KSKSJe#78$WhV O@o@ April 18, 1906, California's San Andreas Fault snaps, shaking San Francisco for nearly 60 terrifying seconds .When the trembling stops, the disaster is only beginning. Gas lines rupture, setting off massive fires, some 700 people die. Most of the city is reduced to ruins. This trembling of the ground caused when masses of rocks suddenly shift below the Earth s surface is called an earthquake. Hundreds of little earthquakes shake the planet every day, but most pass unnoticed. They usually occur along the boundaries of the thin plates that cover the Earth like an egg shell. Driven by the heat deep within the Earth s core, the plates grind against each other along lines called faults. When a plate s motion is blocked, stress builds up. Finally the fault gives way. The released energy raises through the Earth in the form of seismic waves .Scientists record these waves on a device called a seismograph.These zigzag lines show the strength of various seismic waves. 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