高二英语课件高二英语下学期unit13高二英语课件

Unit13TheWaterplanetAbout75%____ofthelivingspaceonearthisintheoceans.Marinelifeisincredibly_______________.99%rich&variedWhatpercentageoftheearthiscoveredbywater?Para.1MarinelifechemicalstructurePara.2salinityPara.3DensityPara.4HeatCapacityPara.5OceanmotionPara.6ThestructureofthetextPara.7TheimportanceofprotectingwaterThepropertiesofwaterCarefulreadingThereareaboutfivemillionspecies,rangingfromthetiniestplanktontogiantslikesharksandwhalesHowmanyspeciesarethereintheoceans?Paragraph1_________makestheoceansuchagreatplacetolivein.seawater(saltwater)=________________+________________+_________________*Thesalinityofseawateraffects:___________and_______________dissolvedgasesdissolvedsolidspurewaterweightfreezingpointsalinityofseawater:35‰35%√*Itismadeupof_______________&__________*Thewatermoleculeis______*Ithasaslightly_______andaslightly_________end.*Thenormalstateofwateris__________Paragraph2.2hydrogenAtoms1oxygenatompolarpositivenegativeliquidParagraph3.Paragraph4.Factorsofdensity:___________and___________Unitofdensity:_____________=________________________________Densityofpurewater:_____________=________________________________________________massvolumekg/m3kilogrammespercubicmetre1,000kg/m31cubicmetreofwaterweighs1,000kilogrammes*Theheatcapacityofwateris___________________.*Watercan______and___________heatwithout_________the_____________oftheoceans.Paragraph5.Paragraph6.Howdoesthewaterintheoceanmove?relativelyhighabsorbParagraph7.Wateris_____makeslifepossible.whatDensewatersinksandlessdensewaterispushedtothesurface.giveoffchangingtemperature1Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.2Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.3Purewaterhasahigherfreezingpointandislighterthansaltwater.4Ifasubstancehasadensity888kg/m3,itwillfloatonWater.5Theheatcapacityofwaterisrelativelyhigh,sothatmostanimalsdon’tlikelivinginit.6Themostimportantthingwecanlearnaboutwater,isthatwemustprotectitanduseitwisely.Trueorfalse1Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.()2Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.()FFbillion---millionmadeof---madeupof3Purewaterhasahigherfreezingpointandislighterthansaltwater.()4Ifasubstancehasadensity888kg/m3,itwillfloatonWater.()5Theheatcapacityofwaterisrelativelyhigh,sothatmostanimalsdon’tlikelivinginit.()6Themostimportantthingwecanlearnaboutwater,isthatwemustprotectitanduseitwisely.()TTFTPost—readingFillintheblanksSeenfromthespace,theearthisan______planet.Waterisveryimportanttolife.Itissaidthatlifeontheplanetbeganinthe______.Marinelifeis_________rich.Lifeintheoceans_________fromthetiniest__________uptogiantslike_____and____.Thewatermolecule_______________2hydrogenatomsand1oxygenatom.Waterexistsinthreestates.Ithasarelativelyhigh__________point.oceanoceansincrediblyrangesallthewaysharkswhalesismadeupoffreezingConsolidationSaltwaterhasa________freezingpointandis________thanfreshwater.Therearemany_____ofmarinelife.Thereislifeevenonthe________ofthedeepestoceans.Thecreaturesontheoceanfloormanagetosurvivewithout________andget_________fromothersourceslowerheavierspeciesbottomsunlightenergyFillintheform:propertyWhatisit?Whatisitgoodfor?chemicalstructuredensity2hydrogenatomsand1oxygenatomItcanbreakdownbothsolids&gasesandgoodforlivingthingstoliveintheocean,especially...Ithelpssmallcreaturestofloat.Densityistherelationshipbetweenmassandvolume.PropertyWhatisit?Whatisitgoodfor?heatcapacityoceanmotionItistheamountofenergyittakestoraisethetemperatureofasubstanceonedegreecentigrade.ItkeepstheoceansandtheearthatasteadytemperatureThecirculationaddsenergytomarineecosystemandmovesnutrientsaround.It’sthemovementofwatercausedbychangesinsalinity&temperature.