【正文】 room temperature. Water has a relatively high freezing point. Water has density 1, 000 kg/m3. Water has high heat capacity. … 2. What causes water to have such unique properties? － Its molecule form / chemical structure. 3. What is water molecule like? Chemical structure: two hydrogen atoms and one oxygen atom. Different parts of it: a slightly positive end and a slightly negative end, so it is polar. The function of it: it causes water to be able to dissolve both solids and gases, and that‘s why water can break down nutrients quickly. 4. Do pure water and salt water have the same chemical structure? Does pure water have salinity? Qs: 1) What‘s salinity? 2) What is sea / salt water? － A mixture of pure water, dissolved gases and solids. 3) How does salinity affect water? 4) How does it affect water‘s weight and freezing point? － The higher salinity water has, the heavier the water is. The higher salinity is, the lower the freezing point of water is. 5. Salinity also has something to do with the density of water. The higher salinity is, the higher density of water is. Qs: 1) What is density? 2) How is density measured? 3) Which is denser, water or oil? 4) What will happen when water and oil are in the same container? What does this phenomenon illustrate? － Oil floats on water. A less dense substance floats on a denser substance. 5) Does water in the same ocean have the same density? － No. Denser water sinks and pushes less dense water to the surface. 6. That‘s why the ocean water will never stop moving. Qs: 1) What does ocean motion mean? 2) How does ocean motion work? － Denser water sinks and pushes less dense water to the surface. Ocean motion helps move nutrients around and adds energy to the marine ecosystems. 3) What causes ocean motion? － Changes in salinity and temperature. 7. The temperature of the ocean water always keeps steady, making the ocean a safe and fortable habitat. Do you know why? － Water has a relatively high heat capacity. Qs: 1) What is heat capacity? 2) What‘s the function of heat capacity? － It determines how a substance absorbs and releases heat。s resolution 47/193 of 22 December 1992. It is a unique occasion to remind everybody that concrete efforts to provide clean drinking water and increase awareness worldwide of the problems and of the solutions, can help make the difference. 4) Last year we witnessed some great disasters such as the typhoon ―Yunna‖ and the tsunami in the India Ocean. What a coincidence that the theme for World Water Day 20xx was ―Water and Disaster‖. World Water Day 20xx will be guided by the uping water decade39。 It39。s colorless, tasteless, odorless and universal dissolvent. It feels wet。 Unit 13The water pla 教學(xué)設(shè)計(jì) 1 Teaching goals: 1. Talk about water and the ocean 2. Practice making suggestions and expressing opinions 3. Review Modal Verbs 4. Write an explanation paragraph Teaching Plan: (Six Periods) 1st period: Warmingup and Speaking 2nd period: Listening 3rd period: Reading 4th period: Integrating Skills 5th period: Grammar 6th period: Exercises Period 1 Warming up amp。 It exists in three forms: liquid, solid, gas, and is cycled through the water cycle。s part of every living anism on the pla。s theme Water for Life. It will be the starting day for this International Decade for Action, Water for Life. 2. Whilespeaking 1) To some extent, the existence of World Water Day also implies that human beings cannot live without water. Why? Can you tell how water is being used in our life? Give some examples. － Electricity, agriculture, home use, industry, transport, entertainment, etc. 2) Look at the first picture (―electricity‖) in the textbook and talk about it. The water is being used to generate electricity. Building up behind a high dam, water accumulates potential energy (勢(shì)能 ). This is transformed into mechanical energy when the water rushes down. It is a good way to use water because water is renewable green energy. It will never run out if only we use it properly and generating electricity by using water is a better way to protect the environment than others. However, it takes a great sum of money and a long period of time to build a dam and prepare all the required equipment. Since nowadays electricity has already been an indispensable part of our life, most people benefit from using water in this way. 3) Group work. Divide students into several groups with six in each. Each one takes charge of one picture. When discussing each picture, please think about the following questions: How is water being used? What property of water enables it to be used in this way? Why do we use water in this way? Who benefits from using water in this way? Is this a good way to use water? What are some disadvantages of using water in this way? 4) Pair work. Each sixmember group can be divided into three smaller ones with two in each. Make a dialogue on the basis of the results about your topics we reach, using following useful expressions: The water is being used to / for … We should / could … What will we do if …? If we … , we can … It would be better to … Can you think of a better way Step 4. Homework: Recite the new words and expressions in this unit. Period 2 Listening Teaching Aims and Demands: Listen to the tape and improve the Ss‘ ability to listen to poems and stories. Teaching Difficult Point: Grasp the main idea of the poem by listening to the tape. . . Teaching Aids: A tape recorder, the blackboard Teaching Procedures: Step 1. Prelistening Give a very brief introduction of The Rime of the Ancient Mariner and its author Samuel Taylor Coleridge. Here rime is the variant of rhyme. S