1.1地球上的水(课件 18PPT 双语教学)

(共18张PPT)
肤白貌美小可爱
凶神恶煞大魔头





1.4
Water is an integral part of life
What happened ?
Water occupies 60% of a grown-up body.


30-40kg

Weight

equals 6L
40-50kg

Weight

50-60kg

Weight

60-70kg

Weight

…
…
…
The water content is not fixed at 60%
Percentage decreases

As you get older

As you become fatter


60%
70%
50%
50%
“Male is made of water”

https://www.youtube.com/watch?v=9iMG
FqMmUFs&t=144s

Different organ has water with different percentage



启动计时器

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时间限制：
5 分钟
Discussion：喝水有哪些需要注意的地方？

1、Do we need to drink eight
bottles of water one day?
2、Will the Stomach acid be diluted if we drink water during eating time?
If you drunk 2 liters water for one time.
2.5L
2L
Which kind of water is better? Acidic water or alkaline water.

Either. It is up to you.
Can we drink water which has been laying on the table for one night?
As long as you keep your cup
closed.
上午的水晚上都能喝，晚上的水早
上喝有错吗？
Can we drink water that is repeatedly boiled?
老火靓汤都敢喝，想多开几次的水有错吗？
SEARCH(homework):

The damage of drinking too

much or too little water.
https://www.youtube.com/watch?v=gBbFxl6Oy94


Cycle of water
海洋
陆地
大气
atmosphere
蒸发
地下水流失
泉、溪流、淡水湖
蒸发、蒸腾（植物）




降水

降水

Pros and cons of cycle of water



水的总量不变，可再生
复杂的天气现象
改变地表形态
降水分布不均匀
弊
利
利
利
洪涝或干旱




保护土壤不受严重的冲刷利于土壤对水分的吸收
砍伐森林 过度放牧
Water of human beings
The Water Cycle






REVIEW
Painting(homework):

draw a picture about Cycle of Water containing what we have learned in this class.