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EarthquakesfloodtyphoonfireHaveyougonethroughanynaturaldisaster?Whatdamagediditcause?TangshanandSanFrancisco,Peoplelosetheirhomes.Roadsgethugecracks. Thebridgesfalldown. Steamburstfromholesintheground. Waterpipesaredestroyed. Therailwaytracksareuselesspiecesofsteel.Thewholecityliesinruins. Canweavoid(避免)orreduce(减少)thedamage? Whatmayhappenbeforeanearthquake?Let’slookatsomesigns(前兆). signs(前兆). 1.Peopleseebrightlightsinthesky. 2.Animalsaretoonervoustoeat. 3.Micerunoutofthefieldsforplacestohide. Fishjumpoutofthepond. 4.Thewellwallshavedeepcracksinthem. Howdoesanearthquakehappen?Whydoearthquakeshappen?Scientistsexplainthatthe______oftheearthismadeofanumberofdifferent________. AtSanFrancisco,thePacificplatewhichismovingtowardsthe______meetstheNorthAmericanplate.ThePacificplateismovingveryslowlyat____cmayear.Sometimesthesetwoplatesstopanddonotmoveforyears.Thensuddenly,they_______andanearthquakeis______.HOMEWORK:

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