上海牛津7Bwater festival公开课

Water is important.
We should try our best to save it!
Make a summary
• form n. 形态；形式 • melt v. 融化 • boil v.煮沸 •freeze v. （使冻结，结冰） (froze--frozen) •cool down 变凉；冷却下来 •turn into 转变成；将……变成
• When water freezes, it turns into ice.
Put some ice cubes in a glass of water. Wait for 2 minutes. Look at the outside of the glass. What is on the glass? How does it happen?
7) How many forms does water have?
形态；形式
turn into
water
转变成
ice
steam
e e fr_ _ze
b _o _ i_ l _
/ bɔil /
melt
/ melt
Look and match: A. freeze B. melt C. cool down D. boil
② ③ ④ ①
Group Competition:
What happens when water boils?
• When water boils ,it turns into steam.
What happens when ice melts?
• When ice melts, it turns into water.
The three forms of water
Nothing can cut me.
If you wash me more, I will be dirtier. I have no smell, no colour.
• Who am I?
Yeah! I am water!
源自文库
Water Quiz
4) A hundred years ago, earth had_______. A. much more water than there is now B. a lot less water than there is now C. the same amount there is now 5) How long could you live without water? A. About three months B. About seven days C. About one day 6) Water that is safe to drink is called____. A. clean B. polluted C. drinkable
Put a dry lid on a glass of hot water. Wait for 10 seconds (秒).Take the lid off. What can you see under the lid?
• Drops of water.
What happens when water freezes?
• Drops of water. • The steam in the air turns into water on the cold glass.
What happens when steam cools down?
• When steam cools down, it turns into water.
melt②
③
cool down 冷却
④ ①
freeze
boil
Listen and fill in the blanks
• • • • • • • •
happens What _______ when water boils? boils steam When water ______, it turns into ______. when water freezes? What happens _____ freezes it turns ____ into ice. When water _____, What happens when ice melts? water When water melts, it turns into _____. cools down? What happens when steam ____ steam cools down, it ____ turns____ into water. When _____
When..., it turns into...
The three forms of water
A: What happens when…
boils freezes ? melts cools down
B: When …, it turns into ….
Look and say
When…, it….
Read and fill in the blanks:
Water orms they are s______, team ice and water. When Water has three f______, oils reezes it turns water b_____, it turns into steam. When water f______, elts ools into ice. When ice m_____, it turns into water. When steam c____ d____, own it turns into water, too. If you put a dry lid on a glass of hot ake the lid o__, water, and wait for ten seconds, then t_____ ff you’ll find drops of water on the lid. That’s because the hot water in the glass urns i___ nto steam and the steam turns into drops of water on the t____ lid. If you put some ice cubes in a glass of water and wait for two minutes, then look at the o______ utside of the glass, you’ll find d____ rops of water on the glass, too. That’s because the steam in the air turns old glass. into water on the c___ All living things need water to live. People can live s_____ everal weeks ithout water. We should drink without food, but only a few days w_____ lasses of water each day! 6-8 g______ Without water, the earth would look like the moon. How terrible it o water! would be if there were n__
1) How much of the water on earth is available(可利用的） to drink? A. 95% B. 26% C. 1% 2) How much of your body is made up of water? A. 75% B. 25% C. 6% 3) How much water should you drink daily for good health? A. 1-2 glasses B. 3-4 glasses C. 6-8 glasses
• What happens when water boils? when water freezes? when ice melts? when steam cools down? • When…,it turns into _____.
Assignment:
• Oral work: Read the text after the recording at least 3 times. • Written work: 1. Copy the new words and phrases. 2. Find out the uses of water, steam and ice and try to write at least 50 words on the topic ‘Water/ Steam/ ice’ You can use the sentences: 1) When … it turns into… 2) We use … to… 3.) If there is no…