高中英语 unit13 The Water Planit课件 新人教版 课件VIP免费

Whyisitblue?WaterPlanetWhatcanwaterbeusedfor?drinkWashclothesirrigationtransportprovidelivingspaceformarinelifeTheyarefloatingonthesurfaceofDeadSea.Canyouexplainhowtheycandothis?entertainmentpropertipropertiesesWhatpropertiesorWhatpropertiesorcharacteristicsdoyouknowcharacteristicsdoyouknowaboutwater?aboutwater?colorlesscolorlesstastelesstastelessodorlessodorlessthreethreeformsformsfeelingwetfeelingwetabsorbingheatabsorbingheatdissolvingdissolving1.Whatelsehaveyoulearnedaboutwaterandthewaterplanet?3.Doyouknowanypropertiesofwater?2.Whatwouldhappeniftherewerenowateronourplanet?Activity1Activity1..StructureofthepassageStructureofthepassage1minutetoskimthepassageandfillinthechartbelow.Youdonotneedtoreadthewholetext.ThepropertiesofwaterchemicalstructuresalinitydensityheatcapacityoceanmotionCarefulCarefulReadingReading______________percentofthelivingspaceon______________percentofthelivingspaceonearthisintheoceans.earthisintheoceans.Thereareabout_______________speciesinThereareabout_______________speciesintheoceans.theoceans.Marinelifeisincrediblyrichandvaried.Paragraph1Ninety-nineNinety-ninefivemillion海洋生物数量之大，种类之多，简直难以置信Lifeintheoceansrangesfromthetiniestplanktonallthewayuptogiantslikesharksandwhales.rangefrom…to/rangebetween…and…__从…到..之间变化___N:范围，射程awiderangeofinterestsandhobbiesWhatistherangeofthegun?海洋里的生物从微小的浮游生物到巨大动物，如鲨鱼和鲸鱼，都无所不包。Normalstateofwater:solidliquidgasnegativeend:+–↑↓positiveend:+–↑↓polar:+–↑↓medium:averagechannelmeansconditionH2O:2_______________+1____________=1___________HydrogenAtomsHydrogenAtomsOxygenAtomOxygenAtomHH22OMoleculeOMolecule√√√√√√√√√√√√Paragraph2Water’suniquechemicalstructureOxygenOxygenAtomAtomHydrogeHydrogenAtomnAtomapolarapolar(adj.(adj.极极性的性的))moleculemoleculeButthewaythewatermoleculeisformedgiveswateritsuniqueproperties但是水分子的结构方式赋予了水独特的性质。Becausewaterispolar,itcanbreakbothsolidsandgases.因为水是极性的，所以它能够分解固体和气体。Thenutrientsinwhateverfallsintotheoceanquicklybecomeavailabletootherlivingcreatures.任何落入海洋的东西其所含的营养物质都能很快被其他生物所利用。（宾语从句）seawater(saltwater)=________________+________________+___________salinityofseawateraffects:___________and______________Saltwaterhasa_______freezingpointandis_______thanpurewater.salinityofseawater:35‰35%√√dissolvedgasesdissolvedgasesdissolvedsolidsdissolvedsolidspurewaterpurewaterweightweightfreezingpointfreezingpointparagraph3lowerheavierthepurewateriswhatgivesseawateritsmainproperties，是纯水赋予了海水的主要特征Thesalinityoftheearth’soceansisaboutthirty-fivepartsperthousand,meaningthatthereareaboutthirty-fivegrammesofdissolvedsolidsandGasesinonekilogrammeofwater.地球海洋里的盐度约为35%0，即在每千克的水中约含有35克溶解的固体和气体Whichmeansthat（表语从句）Factorsofdensity:___________and_______________Unitofdensity:_____________=________________________________Densityofpurewater:________________=____________________________________——————————————————massmassvolumevolumekg/m3kg/m3kilogrammespercubicmetrekilogrammespercubicmetre1,000kg/m31,000kg/m3onecubicmetreofwaterweighsonecubicmetreofwaterweighsParagraph4onethousandkilogrammesonethousandkilogrammesDensityistherelationshipbetweenmassandvolumeandismeasuredinKilogrammespercubic...