1、2021/8/11 星期三1Why is it blue? Water PlanetWhat can water be used for? 2021/8/11 星期三2drinkWash clothes2021/8/11 星期三3irrigationtransport2021/8/11 星期三4provide living space for marine life2021/8/11 星期三5They are floating on the surface of Dead Sea. Can you explain how they can do this?entertainment2021/8

2、/11 星期三6propertiesWhat properties or characteristics do you know about water?colorlesstastelessodorlessthree formsfeeling wetabsorbing heatdissolving2021/8/11 星期三71.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

3、water on our planet?2021/8/11 星期三8Activity 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 waterchemical structure salinity densityheat capacityocean motion2021/8/11 星期三9 Careful Reading 2021/8/11 星期三10_p

4、ercent 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 1Ninety-ninefive million海洋生物數量之大，種類之多，簡直難以置信2021/8/11 星期三11Life in the oceans ranges from the tiniest plankton all the way up to giants like sharks and wh

5、ales. range fromto / range between and _從到.之間變化_ N: 范圍，射程a wide range of interests and hobbiesWhat is the range of the gun?海洋里的生物從微小的浮游生物到巨大動物，如鯊魚和鯨魚，都無所不包。2021/8/11 星期三12Normal state of water: solid liquid gas negative end: + positive end: + polar: + medium: average channel means conditionH2O: 2_ +

6、 1_ = 1_Hydrogen AtomsOxygen AtomH2O MoleculeParagraph 22021/8/11 星期三13Waters unique chemical structure Oxygen AtomHydrogen Atoma polar (adj.極性的)molecule2021/8/11 星期三14But the way the water molecule is formed gives water its unique properties但是水分子的結構方式賦予了水獨特的性質。Because water is polar, it can break b

7、oth solids and gases.因為水是極性的，所以它能夠分解固體和氣體。The nutrients in whatever falls into the ocean quickly become available to other living creatures.任何落入海洋的東西其所含的營養物質都能很快被其他生物所利用。（賓語從句）2021/8/11 星期三15 sea water (salt water) =_+ _+_ salinity of sea water affects: _and_Salt water has a _freezing point and is _

8、than pure water.salinity of sea water: 35 35% dissolved gasesdissolved solidspure waterweightfreezing pointparagraph 3lowerheavier2021/8/11 星期三16 the pure water is what gives sea water its main properties，是純水賦予了海水的主要特征The salinity of the earths oceans is about thirty-five parts per thousand, meaning

9、 that there are about thirty-five grammes of dissolved solids and Gases in one kilogramme of water. 地球海洋里的鹽度約為35%0， 即在每千克的水中約含有35克溶解的固體和氣體Which means that（表語從句）2021/8/11 星期三17Factors of density: _and _Unit of density: _ = _Density of pure water: _=_massvolumekg/m3kilogrammes per cubic metre1,000 kg/

10、m3one cubic metre of water weighsParagraph 4one thousand kilogrammes2021/8/11 星期三18Density is the relationship between mass and volume and is measured in Kilogrammes per cubic metre .密度是指質量與容量的關系，其測量單位是每立方米的公斤數If a substance has a higher density, say 5,000kg/m3Marine animals and plants take advantag

11、e of the density of water.2021/8/11 星期三19With 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. 當水結冰時，它的密度就減小。如果密度不減小，整個海洋就會凍結成固體。如果體型結構適宜的話，他們可以在水中四處游動，而這項任務則

12、是由海水來完成的2021/8/11 星期三20Opposite meaning of absorb: give off change create Heat capacity: water temperature su substance energy Paragraph 52021/8/11 星期三21Heat 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

13、 of heat without big changes in temperature,熱容量是將一種物質的溫度升高一度所需要的能量水可以吸收或放出大量的熱量而其溫度不會有很大變化2021/8/11 星期三22be sensitive to large or sudden changes in temperature（動植物的）生活環境，棲息地The water in the oceans also keeps the temperature of the earth steady by absorbing and giving off heat.對敏感/過敏habitat：海水通過吸收和釋放

14、熱量來使地球的溫度保持穩定2021/8/11 星期三23 Paragraph 7 Main idea: significance of water Paragraph 6How does the water in the ocean move?Dense water sinks and less dense water is pushed to the surface.2021/8/11 星期三24This circulation adds energy to the marine ecosystems and moves nutrients aroundWater ,which seems

15、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.這種循環給海洋生態系統增加了能量，并使營養物質向四周移動水，看似簡單而平凡，卻是它使生命成為可能。然而對水我們所了解的最重要的是：我們必須保護它，合理利用它。（非限制性定語從句）（表語從句）（定語從句）（表語從句）2021/8/11 星期三25Water 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 縮小) when it freezes.Pure water has a higher freezing point and lighter than salt water.The salinity of the earths oceans