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1、Why is it blue?Water PlanetWhat can water be used for?drinkWash clothesirrigationtransportprovide living space for marine lifeThey are floating on the surface of Dead Sea.Can you explain how they can do this?entertainmentpropertiesWhat properties or characteristics do you know about water?colorlessc
2、olorlesstastelesstastelessodorlessodorlessthree three formsformsfeeling wetfeeling wetabsorbing heatabsorbing heatdissolvingdissolving1.What else have you learned about water and the water planet?3.Do you know any properties of water?2.What would happen if there were no water on our planet?Activity
3、1.Structure of the passageStructure of the passage 1 minute to skim the passage and fill in the chart below.You do not need to read the whole text.The properties of waterchemical structure salinity densityheat capacityocean motion Careful Reading _percentofthelivingspaceonearthisintheoceans.Thereare
4、about_speciesintheoceans.Marine life is incredibly rich and varied.Paragraph 1Ninety-ninefive million海洋生物数量之大，种类之多，简直难以置信Lifeintheoceansrangesfromthetiniestplanktonallthewayuptogiantslikesharksandwhales.rangefromto/rangebetweenand _从从到到.之间变化之间变化_N:范围，射程范围，射程awiderangeofinterestsandhobbiesWhatisthera
5、ngeofthegun?海洋里的生物从微小的浮游生物到巨大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。动物，如鲨鱼和鲸鱼，都无所不包。Normal state of water:Normal state of water:solid liquid gas negative end:+negative end:+positive end:+positive end:+polar:+polar:+medium:medium:average channel means conditionH H2 2O:O:2 2_ +_ +1 1_ _=1 1_Hydrogen AtomsHy
6、drogen AtomsHydrogen AtomsHydrogen AtomsOxygen AtomOxygen AtomOxygen AtomOxygen AtomH HH H2 2 2 2O MoleculeO MoleculeO MoleculeO MoleculeParagraph 2Waters unique chemical structure Oxygen Oxygen AtomAtomHydrogeHydrogen Atomn Atoma polar(adj.(adj.极性的极性的极性的极性的)moleculeBut the way the water molecule is
7、 formed gives water its unique properties但是水分子的结构方式赋予了水独特的性质。但是水分子的结构方式赋予了水独特的性质。Because water is polar,it can break both solids and gases.因为水是极性的，所以它能够分解固体和气体。因为水是极性的，所以它能够分解固体和气体。The nutrients in whatever falls into the ocean quickly become available to other living creatures.任何落入海洋的东西其所含的营养物质都能很快
8、被其他生物所利用。（宾语从句）（宾语从句）sea water(salt water)sea water(salt water)=_+=_+_+_+_ salinity salinity of of sea sea water water affects:affects:_and_and_Salt Salt water water has has a a _freezing _freezing point point and and is is _than _than pure pure water.water.salinity of sea watersalinity of sea water
9、:35:35 35%35%dissolved gasesdissolved gasesdissolved gasesdissolved gasesdissolved solidsdissolved solidsdissolved solidsdissolved solidspure pure pure pure waterwaterwaterwaterweightweightweightweightfreezing pointfreezing pointfreezing pointfreezing pointparagraph 3lowerheavier the pure water is w
10、hat gives sea water its main properties，是纯水赋予了海水的主要特征是纯水赋予了海水的主要特征The salinity of the earths oceans is about thirty-five parts per thousand,meaning that there are about thirty-five grammes of dissolved solids and Gases in one kilogramme of water.地球海洋里的盐度约为地球海洋里的盐度约为35%0，即在每千克的水中即在每千克的水中约含有约含有35克溶解的固
11、体和气体克溶解的固体和气体Which means that（表语从句）（表语从句）Factorsofdensity:_and _Unitofdensity:_=_Densityofpurewater:_=_massvolumekg/m3kilogrammespercubicmetre1,000kg/m3onecubicmetreofwaterweighsParagraph 4onethousandkilogrammesDensity is the relationship between mass and volume and is measured in Kilogrammes per cu
12、bic metre.密度是指质量与容量的关系，其测量单位密度是指质量与容量的关系，其测量单位是每立方米的公斤数是每立方米的公斤数If a substance has a higher density,say 5,000kg/m3Marine animals and plants take advantage of the density of water.With the right kind of body,it is possible to float around in the ocean,and let the water do the work.When water freezes,
13、its density decreases.When water freezes,its density decreases.If it did not,the oceans would be frozen solid.If it did not,the oceans would be frozen solid.当水结冰时，它的密度就减小。如果密度当水结冰时，它的密度就减小。如果密度不减小，整个海洋就会冻结成固体。不减小，整个海洋就会冻结成固体。如果体型结构适宜的话，他们可以在水中四处如果体型结构适宜的话，他们可以在水中四处游动，而这项任务则是由海水来完成的游动，而这项任务则是由海水来完成的O
14、ppositemeaningofabsorb:give off change create Heatcapacity:water temperature su substance energy Paragraph 5Heat capacity is the amount of energy it takes to raise the temperature of a substance by one degree centigrade.Water can absorb and give off a lot of heat without big changes in temperature,热
15、容量是将一种物质的温度升高一度所需要的能量热容量是将一种物质的温度升高一度所需要的能量水可以吸收或放出大量的热量而其温度不会有很大变化水可以吸收或放出大量的热量而其温度不会有很大变化be sensitive to large or sudden changes in temperature（动植物的）生活环境，栖息地（动植物的）生活环境，栖息地The water in the oceans also keeps the temperature of the earth steady by absorbing and giving off heat.对对敏感敏感/过敏过敏habitat：海水通过
16、吸收和释放热量来使地球的温度海水通过吸收和释放热量来使地球的温度保持稳定保持稳定 Paragraph 7Mainidea:significanceofwaterParagraph 6Howdoesthewaterintheoceanmove?Densewatersinksandlessdensewaterispushedtothesurface.This circulation adds energy to the marine ecosystems and moves nutrients aroundWater,which seems so simple and common,is what makes life possible.The most important thing we can learn about water,however,is that we must protect it and use it wisely.这种循环给海洋生态系统增加了能量，并使营养物质向四周移动这种循环给海洋生态系统增加了能量，并使营养物质向四周移动水，看似简单而平凡，却是它使生命成为可能
