广西钦州市大寺中学高二英语人教版《unit13 the properties of waterreading》课件

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1、Unit13ThePropertiesofWaterWhyisitblue?WaterPlanetWhatcanwaterbeusedfor?drinkWashclothesirrigationtransportprovidelivingspaceformarinelifeTheyarefloatingonthesurfaceofDeadSea.Canyouexplainhowtheycandothis?entertainmentCanyougivemesomewords,phrasesorse

2、ntencesrelativetowater?Wherethereisariver,thereisacity!Wherethereiswater,thereislife!22nd,MarchWhatpropertiesorcharacteristicsdoyouknowaboutwater?colorlesstastelesshavingnofixedshapethreeformsfeelingwetkeepinglevelabsorbingheatpropertiesUnit13ThePro

3、pertiesofWaterPropertiesofWaterPara.1chemicalstructurePara.2salinityPara.3DensityPara.4HeatCapacityPara.5OceanmotionPara.6Howisthetextorganized?importanceofWaterPara.7FastReading:1.Waterhasarelativelylowfreezingpoint.2.YouwilldrownintheDeadSea.3.Wate

4、risliquidatroomtemperature.4.Saltwaterisheavierthanfreshwater.5.Thedensityofwateris1,000kg/m3.6.Theoceanwillfreezetotally.7.Thesalinityoftheearth’soceansisabout3.5%8.Whenwaterfreezes,itsdensityincreases.TrueorFalse1.Thereareaboutfivebillionspeciesint

5、heoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.2.Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.FT3.Thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.4.Waterisaliquidatroomtemperature,andithas

6、arelativelylowfreezingpoint.5.Thesalinityoftheearth’soceansisabout35‰.FFT6.Purewaterhasahigherfreezingpointandislighterthansaltwater.7.Ifasubstancehasadensity800kg/m3,itwillfloatonWater.8.Whenwaterfreezes,itsdensityincreases.TFT9.Watergetssmallerwhen

7、itfreezes.10.Otherrecoursessuchasoil,gas,goldandsoon,areaspreciousasadropofrain.11.Themostimportantthingwecanlearnaboutwateristhatwemustprotectitanduseitwisely.FFTIntroduction(Para1):Whydowecallitanoceanplanet?Lifeontheearthbeganintheoceansaboutthree

8、billionyearsago;99%ofthelivingspaceonearthisintheoceans;Thereareaboutfivemillion(known)speciesintheoceans;Lifeintheoceansrangesfromtinyplanktontogiantsharksandwhales.Oceanisagreatplacetolive.---Water.Whatiswatermadeupof?Themoleculeofwaterismadeupoftw