Grade2•Unit4•Week21Copyright©TheMcGraw-HillCompanies,Inc.RenXiaogang/XinhuaPress/CorbisEarthquakesGuidedRetellingWhatcanhappenduringanearthquake?Whyareearthquakesbignews?ModeledRetellingAnearthquakecancausehousestoshakeordishestorattle.Strongearthquakesarebignews.AbigearthquakehitChinain2010.In2011,anearthquakemovedJapan’smainisland8feet.BeginningThisdamagewascausedbyan.Strongearthquakesarebig.IntermediateWhatcanhappenwhenthereisanearthquake?Wherehavesomestrongearthquakeshappened?AdvancedDescribewhathappensduringanearthquake.Whyarestrongearthquakesbignews?ENGLISHLANGUAGELEARNERSGrade2•Unit4•Week22Copyright©TheMcGraw-HillCompanies,Inc.RobertE.Wallace/U.S.GeologicalSurveyEarthquakesGuidedRetellingWheredoearthquakesusuallyhappen?Whatcanearthquakescause?ModeledRetellingEarthquakesoftenhappenneardeepcracksinthegroundcalledfaultlines.StrongearthquakeshappenneartheSanAndreasFaultinCalifornia.Earthquakescancracktheground.Theycancauselandslidesandhugewaves.BeginningWhatisthislinecalled?Whatcanhappennearfaultlines?IntermediateWheredoearthquakesoftenhappen?Whatisonepossibleeffectofanearthquake?AdvancedWhatarefaultlines?WhereistheSanAndreasfault?Whataresomepossibleeffectsofearthquakes?ENGLISHLANGUAGELEARNERSEpicenterFaultGrade2•Unit4•Week23Copyright©TheMcGraw-HillCompanies,Inc.IllustratedbyRobSchusterEarthquakesGuidedRetellingWhatisEarth’scrustmadeof?Howcantheseplatescauseearthquakes?Whatcausesshockwaves?Whereisanearthquakestrongest?ModeledRetellingEarth’scrustismadeupofbrokenpiecescalledplates.Thesepiecesmoveslowly.Whentheypullawayfromeachother,rockscanexplodecausingshockwaves.Thepointwhereashockwavebeginsiscalledthefocus.Whentheshockwavesreachthesurface,anearthquakehappens.Anearthquakeisstrongestattheepicenter.BeginningEarth’scrustismadeof.Theplatescanpullawayfromeachothercausing.IntermediateWhatisEarth’scrustmadeupof?Whathappenswhenthesethingspullawayfromeachother?AdvancedExplainwhatcausesshockwaves.Describewhathappenswhentheseshockwavesreachthesurface.ENGLI...
