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1、drinkWash clothesirrigationtransportThe main idea of each paragraphPara1Para1Para2Para2Para3Para3Para4Para4Properties of water make ocean a place to live.The chemical structure of water makes it an excellent medium for life.The salinity of sea water or salt water.The density of pure water and sea wa
2、terPara5Para5Para6Para6Para7Para7The main idea of each paragraphHeat capacity & its importance to lifeHow ocean motion worksHow important water means to lifeCareful ReadingLIFE IN THE OCEANSLife on earth began in oceans _ years ago._of the living space on earth is in the oceans. therere_ in the ocea
3、ns life in the oceans ranges from the _ _to_.three billionfive million species 99tiniest planktongiant whalesChemical structureThe water molecule is made up of two_atoms and one_atom. Because water is_, it can _ solids and gases.hydrogenoxygenpolarbreak downSALINITY 1.How is the salinity of water fo
4、rmed?Dissolved gases and solids mix with pure water.2. How much is the salinity of the oceans?About thirty five parts per thousand.3.what does salinity of sea water affect?It affects its weigh and freezing point.Density 1.Density consists of mass and volume.( )2.The density of pure water is 2000 kg/
5、m3( ) 3.Oil has a density lower than 1000 kg/m3, so it will float on water. ( )4.The density of water helps marine animals and plants float.( ) TFTTHEAT CAPACITYIt is the amount of energy it takes to raise temperature of a substance one degree centigrade.It creates a stable environment for life in t
6、he ocean, and also keeps the temperature of the earth steady.OCEAN MOTION1. Why is the water in the ocean moving? Since changes in salinity and temperature affect waters density.2. How does ocean motion work? More dense water sinks and pushes less dense water to the surface. 3.why is water important to all living things?It makes life possible . Our future relies on it.WHAT SHOULD WE DO TO PROTECT WATER FROM BEING POLLUTED?
高二英語Unit 13 the water planet 課件2人教版
