廣西欽州市高二英語(yǔ)《Unit 13 The properties of waterReading》課件 新人教版

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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?entertainmentCan you give me some words ,phrases or sentences relative towater?WHERE THER

2、E IS A RIVER,THERE IS A CITY!colorlesstastelesshaving no fixed shapethree formsfeeling wetkeeping levelabsorbing heatProperties of WaterProperties of WaterPara.1Para.1chemical chemical structurestructurePara.2Para.2salinitysalinityPara.3Para.3DensityDensityPara.4Para.4Heat Heat CapacityCapacityPara.

3、5Para.5OceanOcean motion motionPara.6Para.6 How is the text organized ? How is the text organized ?importance of Waterimportance of WaterPara.7Para.7FAST READING :1. Water has a relatively low freezing point.2. You will drown in the Dead Sea.3. Water is liquid at room temperature.4. Salt water is he

4、avier than fresh water. 5. The density of water is 1,000kg/m3.6. The ocean will freeze totally.7. The salinity of the earths oceans is about 3.5% 8.When water freezes, its density increases.True or False 1. There are about five billion species in the oceans ranging from the tiniest plankton to giant

5、s like sharks and whales. 2. The water molecule is made of two hydrogen atoms and one oxygen atom. FT3. The reason why water can dissolve most substances on earth is that water has high heat capacity.4. Water is a liquid at room temperature, and it has a relatively low freezing point.5. The salinity

6、 of the earths oceans is about 35.FFT6. Pure water has a higher freezing point and is lighter than salt water. 7. If a substance has a density 800kg/ m3, it will float on Water. 8. When water freezes, its density increases.TFT 9. Water gets smaller when it freezes.10. Other recourses such as oil, ga

7、s, gold and so on, are as precious as a drop of rain.11. The most important thing we can learn about water is that we must protect it and use it wisely. FFTINTRODUCTION (PARA1):Why do we call it an ocean planet?Ocean is a great place to live.-Water.What is water made up of ? The molecule of water is

8、 made up of two hydrogen atoms and one oxygen atom.Salinity Salinity (Para3)(Para3)sea watersea water= salt water= salt waterdissolved solidsdissolved solidsand gasesand gasespure waterpure waterThe salinity of the oceans:_.thirty-five parts per thousand (3.5%)Key points:(one kilogramme)(35 grammes)

9、The salinity affects: _ and _.weightfreezing point(heavier)(lower)Heat Capacity Heat Capacity (Para5)(Para5)Heat Heat CapacityCapacitythe amount of energy it takes to the amount of energy it takes to raise the temperature of a substance raise the temperature of a substance by one degree centigradeby

10、 one degree centigraderelatively highwaterwaterheatheatabsorb and give offabsorb and give offCreate a stable environment so the ocean is a safe and comfortable habitat.Waves Density Density ( (Para4)DensityDensitymassmassvolumevolumeRelationshipKey points:The density of pure water:_. 1,000 kg/m3(one cubic metre)(1,000 kilogrammes)Marine animals and plants take advantage of the density of water. Did you know. . .90% of your lungs is water?85% of your blood is water?75% of your brain is water?70% of your skin is water? Nothing is as _ as a drop of water. precious