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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,Why is it blue?,Water Planet,What can water be used for?,drink,Wash clothes,irrigation,transport,provide living space for marine life,They are floating on the surface of Dead Sea.Can you explain how they can do this?,entertainment,properties,What properties or characteristics do you know about water?,colorless,tasteless,odorless,three forms,feeling wet,absorbing heat,dissolving,1.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 1,.,Structure 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 water,chemical structure,salinity,density,heat capacity,ocean motion,Careful Reading,_percent of the living space on earth is in the oceans.,There are about _ species in the oceans.,Marine life is incredibly rich and varied.,Paragraph 1,Ninety-nine,five million,海洋生物数量之大，种类之多，简直难以置信,Life in the oceans,ranges from,the tiniest plankton,all the way up to,giants like sharks and whales.,range fromto/range between and,_,从到.之间变化,_,N:范围，射程,a wide range of interests and hobbies,What is the range of the gun?,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。,Normal state of water:,solid liquid gas,negative end:+,positive end:+,polar:+,medium:,average,channel,means condition,H,2,O:,2,_ +,1,_,=,1,_,Hydrogen Atoms,Oxygen Atom,H,2,O Molecule,Paragraph 2,Waters unique chemical structure,Oxygen Atom,Hydrogen Atom,a polar,(adj.极性的),molecule,But the way the water molecule is 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。,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。,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,快被其他生物所利用。,（宾语从句）,sea water(salt water),=_+_+_,salinity of sea water affects:_and_,Salt water has a _freezing point and is _than pure water.,salinity of sea water,:35 35%,dissolved gases,dissolved solids,pure water,weight,freezing point,paragraph 3,lower,heavier,the pure water is what gives sea water,its main properties，,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,35%,0,，,即在每千克的水中约含有35克溶解的固体和气体,Which means that,（表语从句）,Factors of density:,_and _,Unit of density:,_,=,_,Density of pure water:,_,=,_,mass,volume,kg/m3,kilogrammes per cubic metre,1,000 kg/m3,one cubic metre of water weighs,Paragraph 4,one thousand kilogrammes,Density is the relationship between mass and,volume and is measured in Kilogrammes per,cubic metre.,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,If a substance has a higher density,say 5,000kg/m,3,Marine 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,its density decreases.,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,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,游动，而这项任务则是由海水来完成的,Opposite meaning of absorb:,give off change create,Heat capacity:,water temperature,su,substance energy,Paragraph 5,Heat 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,be sensitive to large or sudden,changes in temperature,（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.,对敏感/过敏,habitat：,海水通过吸收和释放热量来使地球的温度,保持稳定,Paragraph 7,Main idea:,significance of water,Paragraph 6,How does the water in the ocean move?,Dense water sinks and less dense water is pushed to the surface.,This circulation adds energy to the marine,ecosystems and moves nutrients around,Water,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,水，看似简单而平凡，却是它使生命成为可能。,然而对水我们所了解的最重要的是：,我们必须保护它，合理利用它。,（非限制性定语从句）,（表语从句）,（定语从句）,（表语从句）,Water is a liquid at room temperature.,The reason why water can break down other substances on earth is that water has high heat capacity.,Like all the other substances,water gets smaller(contract 缩小)when it freezes.,Pure water has a higher freezing point and lighter than salt water.,The salinity of the earths oceans is about 3.5%.,When water freezes,its density increases.,Other recourses such as oil,gas,gold etc are as precious as a drop of rain.,Quiz:True or False,用 呵护,心,discussion,What should we do to protect water from being polluted?,9,、静夜四无邻，荒居旧业贫。,2024/11/11,2024/11/11,Monday,November 11,2024,10,、雨中黄叶树，灯下白头人。,2024/11/11,2024/11/11,2024/11/11,11/11/2024 11:29:11 AM,11,、以我独沈久，愧君相见频。,2024/11/11,2024/11/11,2024/11/11,Nov-24,11-
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