高中英语 The water planetreading课件 新人教版选修7 课件VIP专享VIP免费

UniUnittUniUnitt1313（（Reading））ThewaterplanetWhatiswatermadeupof?Themoleculeofwaterismadeupoftwohydrogenatomsandoneoxygenatom.WhatpropertiesorcharacteristicsdoWhatpropertiesorcharacteristicsdoyouknowaboutwater?youknowaboutwater?colorlesstastelesshavingnofixedshapethreeformsfeelingwetkeepinglevel?absorbingheatpropertiespropertiespropertiesproperties2222ndnd,March,MarchWherethereisariver,thereisacity!WherethereisWherethereiswater,thereiswater,thereislife!life!While-readingWhile-readingThepropertiesofwaterThepropertiesofwaterOceanMotionOceanMotionHeatCapacityHeatCapacitySalinitySalinityChemicalStructureChemicalStructureDensityDensityPropertiesofWaterPara.1chemicalstructurePara.2salinityPara.3DensityPara.4HeatCapacityPara.5OceanmotionPara.6Howisthetextorganized?importanceofWaterPara.7Para.1Para.2Para.3Para.4Para.5Para.6Para.7Thepropertiesofwatermaketheoceanagreatplacetolive.Thechemicalstructureofwatermakesitanexcellentmediumforlife.Thesalinityofseawateraffectsbothitsweightandfreezingpoint.Marineanimalsandplantstakeadvantageofthedensityofwater.Heatcapacityisthemountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade.Sincechangesinsalinityandtemperatureaffectwater'sdensity,thewaterintheoceanisalwaysmoving.Learningaboutthepropertiesofwaterhelpsusunderstandlifeonourplanet.ThemainideaofeachparagraphTrueorFalseTrueorFalse1.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.FFT1.Reviewthepropertiesof1.Reviewthepropertiesofwater.water.2.2.FinishexercisesinthePost-reading.