下学期unit13reading高二英语课件
日期：2010-06-18 06:33
phrasesorsentencesrelativetowater?Whatpropertiesorcharacteristicsdoyouknowaboutwater?propertiesFastReading:1Waterhasarelativelylowfreezingpoint2YouwilldrownintheDeadSea3Waterisliquidatroomtemperature4Saltwaterisheavierthanfreshwater5Thedensityofwateris1，000kg/m36Theoceanwillfreezetotally7Thesalinityoftheearth’soceansisabout35%8Whenwaterfreezes，Canyougivemesomewords，itsdensityincreasesIntroduction(Para1):Whydowecallitanoceanplanet?Lifeontheearthbeganintheoceansaboutthreebillionyearsago;99%ofthelivingspaceonearthisintheoceans;Thereareaboutfivemillion(known)speciesintheoceans;LifeintheoceansrangesfromtinyplanktontogiantsharksandwhalesOceanisagreatplacetolive---WaterBody(Para2-6)ThePropertiesofWaterChemicalStructureSalinityDensityHeatCapacityOceanMotionHeatCapacity(Para5)HeatCapacitytheamountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigraderelativelyhighwaterheatabsorbandgiveoffCreateastableenvironmentsotheoceanisasaf，
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