高二英语学科课件和教案senior2 unit13 Chunhui Middle School Ivan FangrarG2U13P2 reading.ppt

unit13thewaterplanet thepropertiesofwater reading period2 arcticocean pre reading lookatthetitlesandpicturesinthetext donotreadthewholetext pickoutthetopicofeachparagraphandusethestructuresbelowtomakesixquestions 1 whatis are 2 whatdoes looklike 3 whataredifferentpartsof 4 whatcan becomparedto 5 howdoes work 6 whataresomeexamplesof variousanswersarepossible thepropertiesofwater theearth theocean theocean thespecialair conditioner speciesintheocean theocean structureofthepassage 1minutetoskimthepassage focusingonthetitles titleandsubtitles inthetextandthenfillinthechartbelow youdonotneedtoreadthewholetext chemicalstructure salinity thepropertiesofwater density heatcapacity oceanmotion reading topicsentenceofthetext paragraph sentence topicsentenceofchemicalstructure paragraph sentence 1 2 learningaboutthepropertiesofwaterhelpsusunderstandlifeonourplanet thechemicalstructureofwatermakesitanexcellentmediumforlife findingtopicsentences topicsentenceofsalinity paragraph sentence thesalinityoftheearth soceansisaboutthirty fivepartsperthousand meaningthatthereareaboutthirty fivegrammesofdissolvedsolidsandgasesinonekilogrammeofwater 3 topicsentenceofdensity paragraph sentence 4 thedensityofpurewateris1 000kg m3 meaningthatonecubicmetreofwaterweighsonethousandkilogrammes topicsentenceofheatcapacity paragraph sentence heatcapacityisthemountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade 5 topicsentenceofoceanmotion paragraph sentence sincechangesinsalinityandtemperatureaffectwater sdensity thewaterintheoceanisalwaysmoving 6 carefulreading incredibly unbelievablydoubtfullyextremelyquestionably paragraph1 percentofthelivingspaceonearthisintheoceans thereareabout speciesintheoceans ninety nine fivemillion lifeintheoceansrangesfromthetiniestplanktonallthewayuptogiantslikesharksandwhales paraphrase rangefrom to rangebetween and 从 到 之间变化 alltheway一直 一路上 完全jackclimbedallthewaytothetopofthetree 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 solidliquidgas negativeend positiveend polar medium averagechannelmeanscondition paragraph2h2o 2 1 1 hydrogenatoms oxygenatom h2omolecule whyisthechemicalstructureofwaterimportant 1 becausewaterispolar itcanbreakdownbothsolidsandgases 2 thenutrientsinwhateverfallsintotheoceanquicklybecomeavailabletootherlivingcreatures 3 thechemicalstructureofwateralsomakesitdifferentfromalmosteverythingelseonearth paragraph3 salinityofseawater 35 35 seawater saltwater salinityofseawateraffects and dissolvedgases dissolvedsolids purewater weight freezingpoint factorsofdensity and unitofdensity densityofpurewater mass volume kg m3 kilogrammespercubicmetre 1 000kg m3 onecubicmetreofwaterweighs paragraph4 onethousandkilogrammes oppositeword phraseofabsorb giveoffchangecreate heatcapacity watertemperaturesusubstanceenergy paragraph5 paragraph7mainidea significanceofwatertonature paragraph6howdoesthewaterintheoceanmove densewatersinksandlessdensewaterispushedtothesurface post reading scanandfillintheform taskthree chemicalstructure whatisitgoodfor becausewaterispolar itcanbreakdownnutrientsquickly theycanquicklybecomeavailabletootherlivingcreatures thewatermoleculeismadeupoftwohydrogenatomsandoneoxygenatom thewatermoleculeispolar ithasaslightlynegativeandaslightlypositiveend water suniquechemicalstructure oxygenatom hydrogenatom apolarmolecule density densityistherelationshipbetweenmassandvolume whatisitgoodfor marineanimalsandplantstakeadvantageofthedensityofwater ithelpssmallcreaturestofloat becausethedensityofwaterdecreaseswhenitfreezes theoceanneverfreezestotally heatcapacity heatcapacityistheamountofenergyittakestoraisethetemperatureofasubstanceonedegreecentigrade whatisitgoodfor theheatcapacityofwaterkeepstheoceansatasteadytemperature whichmakesitagoodplacetoliveforcreaturesthataresensitivetosuddenchangesintemperature thewaterintheoceansalsokeepsthetemperature