广西高二英语《Unit-13-The-properties-of-water-Reading》课件-.ppt

广西高二英语《Unit-13-The-properties-of-water-Reading》课件-.ppt

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Unit13ThePropertiesofWater

Whyisitblue?WaterPlanetWhatcanwaterbeusedfor?

drinkWashclothes

irrigationtransport

providelivingspaceformarinelife

TheyarefloatingonthesurfaceofDeadSea.Canyouexplainhowtheycandothis?entertainment

Canyougivemesomewords,phrasesorsentencesrelativetowater?

Wherethereisariver,

thereisacity!Wherethereiswater,thereislife!

22nd,March

Whatpropertiesorcharacteristicsdoyouknowaboutwater?colorlesstastelesshavingnofixedshapethreeformsfeelingwetkeepinglevelabsorbingheatproperties

Unit13ThePropertiesofWater

PropertiesofWaterPara.1chemicalstructurePara.2salinityPara.3DensityPara.4HeatCapacityPara.5OceanmotionPara.6Howisthetextorganized?importanceofWaterPara.7

FastReading:1.Waterhasarelativelylowfreezingpoint.2.YouwilldrownintheDeadSea.3.Waterisliquidatroomtemperature.4.Saltwaterisheavierthanfreshwater.5.Thedensityofwateris1,000kg/m3.6.Theoceanwillfreezetotally.7.Thesalinityoftheearth’soceansisabout3.5%8.Whenwaterfreezes,itsdensityincreases.

TrueorFalse1.Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.2.Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.FT

3.Thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.4.Waterisaliquidatroomtemperature,andithasarelativelylowfreezingpoint.5.Thesalinityoftheearth’soceansisabout35‰.FFT

6.Purewaterhasahigherfreezingpointandislighterthansaltwater.7.Ifasubstancehasadensity800kg/m3,itwillfloatonWater.8.Whenwaterfreezes,itsdensityincreases.TFT

9.Watergetssmallerwhenitfreezes.10.Otherrecoursessuchasoil,gas,goldandsoon,areaspreciousasadropofrain.11.Themostimportantthingwecanlearnaboutwateristhatwemustprotectitanduseitwisely.FFT

Introductio

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