高中英语 The water planet(reading)课件 新人教选修7

1、Unit13（Reading）The water planetWhat is water made up of ? The molecule of water is made up of two hydrogen atoms and one oxygen atom.What properties or characteristics do you know about water?colorlesstastelesshaving no fixed shapethree formsfeeling wetkeeping level ?absorbing heatproperties22nd, Ma

2、rchWhere there is a river,there is a city!Where there is water, there is life!While-readingThe properties of waterOcean MotionHeat CapacitySalinityChemical StructureDensityProperties of WaterPara.1chemical structurePara.2salinityPara.3DensityPara.4Heat CapacityPara.5Ocean motionPara.6 How is the tex

3、t organized ?importance of WaterPara.7Para.1Para.2Para.3Para.4Para.5 Para.6Para.7 The properties of water make the ocean a great place to live.The chemical structure of water makes it an excellent medium for life.The salinity of sea water affects both its weight andfreezing point.Marine animals and

4、plants take advantage of the density of water.Heat capacity is the mount of energy it takes to raise the temperature of a substance by one degree centigrade.Since changes in salinity and temperature affect waters density, the water in the ocean is always moving. Learning about the properties of wate

5、r helps us understand life on our planet.The main idea of each paragraphTrue or False 1. There are about five billion species in the oceans ranging from the tiniest plankton to giants like sharks and whales. 2. The water molecule is made of two hydrogen atoms and one oxygen atom. FT3. The reason why

6、 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 of the earths oceans is about 35.FFT6. Pure water has a higher freezing point and is lighter than salt water. 7. If a

7、 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, gas, 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