广西高二英语《unit13 the properties of waterreading》课件 新人教版

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1、Unit13ThePropertiesofWater1..Whyisitblue?WaterPlanetWhatcanwaterbeusedfor?drinkWashclothes3..irrigationtransport4..providelivingspaceformarinelife5..TheyarefloatingonthesurfaceofDeadSea.Canyouexplainhowtheycandothis?entertainment6..Canyougivemesomewords,phrasesorsentencesrelativetowater?7..Whe

2、rethereisariver,thereisacity!Wherethereiswater,thereislife!22nd,March9..Whatpropertiesorcharacteristicsdoyouknowaboutwater?colorlesstastelesshavingnofixedshapethreeformsfeelingwetkeepinglevelabsorbingheatproperties10..Unit13ThePropertiesofWater11..PropertiesofWaterPara.1chemicalstructurePara.

3、2salinityPara.3DensityPara.4HeatCapacityPara.5OceanmotionPara.6Howisthetextorganized?importanceofWaterPara.712..FastReading:1.Waterhasarelativelylowfreezingpoint.2.YouwilldrownintheDeadSea.3.Waterisliquidatroomtemperature.4.Saltwaterisheavierthanfreshwater.5.Thedensityofwateris1,000kg/m3.6.The

4、oceanwillfreezetotally.7.Thesalinityoftheearth’soceansisabout3.5%8.Whenwaterfreezes,itsdensityincreases.13..TrueorFalse1.Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.2.Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.FT14..3.Thereas

5、onwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.4.Waterisaliquidatroomtemperature,andithasarelativelylowfreezingpoint.5.Thesalinityoftheearth’soceansisabout35‰.FFT15..6.Purewaterhasahigherfreezingpointandislighterthansaltwater.7.Ifasubstancehasadensity800kg/m3,itwillfl

6、oatonWater.8.Whenwaterfreezes,itsdensityincreases.TFT16..9.Watergetssmallerwhenitfreezes.10.Otherrecoursessuchasoil,gas,goldandsoon,areaspreciousasadropofrain.11.Themostimportantthingwecanlearnaboutwateristhatwemustprotectitanduseitwisely.FFT17..Introduction(Para1):Whydowecallitanoceanplanet?1

7、8..19..Lifeontheearthbeganintheoceansaboutthreebillionyearsago;99%ofthelivingspaceonearthisintheoceans;Thereareaboutfivemillion(known)speciesintheoceans;Lifeintheoceansrangesfromtinyplanktontogiantsharksandwhales.Oceanisagreatplacetoliv