廣西高二英語《Unit-13-The-properties-of-water-Reading》課件-新人教版

Unit13ThePropertiesofWaterWhyisitblue?WaterPlanetWhatcanwaterbeusedfor?drinkWashclothesirrigationtransportprovidelivingspaceformarinelifeTheyarefloatingonthesurfaceofDeadSea.Canyouexplainhowtheycandothis?entertainmentCanyougivemesomewords,phrasesorsentencesrelativetowater?Wherethereisariver,

thereisacity!Wherethereiswater,thereislife!22nd,MarchWhatpropertiesorcharacteristicsdoyouknowaboutwater?colorlesstastelesshavingnofixedshapethreeformsfeelingwetkeepinglevelabsorbingheatpropertiesUnit13ThePropertiesofWaterPropertiesofWaterPara.1chemicalstructurePara.2salinityPara.3DensityPara.4HeatCapacityPara.5OceanmotionPara.6Howisthetextorganized?importanceofWaterPara.7FastReading:1.Waterhasarelativelylowfreezingpoint.2.YouwilldrownintheDeadSea.3.Waterisliquidatroomtemperature.4.Saltwaterisheavierthanfreshwater.5.Thedensityofwateris1,000kg/m3.6.Theoceanwillfreezetotally.7.Thesalinityoftheearth’soceansisabout3.5%8.Whenwaterfreezes,itsdensityincreases.TrueorFalse

1.Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.2.Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.FT3.Thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.4.Waterisaliquidatroomtemperature,andithasarelativelylowfreezingpoint.5.Thesalinityoftheearth’soceansisabout35‰.FFT6.Purewaterhasahigherfreezingpointandislighterthansaltwater.7.Ifasubstancehasadensity800kg/m3,itwillfloatonWater.8.Whenwaterfreezes,itsdensityincreases.TFT9.Watergetssmallerwhenitfreezes.10.Otherrecoursessuchasoil,gas,goldandsoon,areaspreciousasadropofrain.11.Themostimportantthingwecanlearnaboutwateristhatwemustprotectitanduseitwisely.FFTIntroduction(Para1):Whydowecallitanoceanplanet?Lifeontheearthbeganintheoceansaboutthreebillionyearsago;99%ofthelivingspaceonearthisintheoceans;Thereareaboutfivemillion(known)speciesintheoceans;Lifeintheoceansrangesfromtinyplanktontogiantsharksandwhales.Oceanisagreatplacetolive.---Water.Whatiswatermadeupof?Themoleculeofwaterismadeupoftwohydrogenatomsandoneoxygenatom.Salinity(Para3)seawater=saltwaterdissolvedsolidsandgasespurewaterThesalinityoftheoceans:____________________________________.thirty-fivepartsperthousand(3.5%)Keypoints:(onekilogramme)(35grammes)Thesalinityaffects:_______and______________.weightfreezingpoint(heavier)(lower)HeatCapacity(Para5)HeatCapacitytheamountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigraderelativelyhighwaterheatabsorbandgiveoffCreateastableenvironmentsotheoceanisasafeandcomfortablehabitat.Whatdodifferentdensitiesintheoceanresultin?Waterintheoceanisalwaysmoving.WavesDensity(Para4)DensitymassvolumeRelationshipKeypoints:Thedensityofpurewater:____________.

1,000kg/m3(onecubicmetre)(1,000kilogrammes)Marineanimalsandplantstakeadvantageofthedensityofwater.Didyouknow...90%ofyourl