warm up : a competition vitalessential,absolutely necessary gradual destruction, wearing away...
TRANSCRIPT
Warm up : a competition
vitalessential,absolutely necessary
gradual destruction, wearing away
huge,very big
exist,happen,is
kill by covering with water
the mixture of gases which are around the earth
dangers
without any form of life
covering, thickness
the nature world around us
erosion
massive
occur
drown
atmosphere
threats
lifeless
layer
environment
Read the first paragraph
1.Is the greenhouse effect harmful or harmless?
2.What are the results of the Greenhouse Effect?
3.What causes the Greenhouse Effect?
It depends on _______________around the earth.
It may cause _____________rise and ______cities.
More and more ______in the atmosphere.
the atmosphere
the level of sea drown
CO2
Threats to our environment
atmosphere
1.The greenhouse effectSun lights Sun lights
heat heat
The normal earth The earth with greenhouse effect
Threats to our enviroment
1.2 Results of the greenhouse effect
It may cause the ice burgmelt and the level of thesea to rise.
It may drown cities and even whole countries.
Answer the questions1.Is the Greenhouse Effect harmful or
harmless?
2.What are the results of the Greenhouse Effect?
3.What causes the Greenhouse Effect?More and more CO2 in the atmosphere.
It may cause the level of sea rise and drown cities.
It depends on the atmosphere around the earth.
Listen to the second paragraph
1.What is the ozone?
2.What are the results of damage to the ozone layer?
3.What causes the damage to the ozone layer?
Threats to our enviroment
2. Damage to the ozone layer2.1 What is the ozone layer ?
Ozone is a gas which occurs 20-50km above the ground.
Without it, ________________________
the sun would
burn us up.
It forms an essential protective layer around the earth.
2.2The results of damage to the ozone layer
Cause eyes disease
Skin cancer
Reduce resistance
Holes in the ozone layer
抵抗力
BAD HABITS OF HUMAN
_____________________which are used in fridges and___________,and to make plastic items are making ______in the ozone layer.
Fast food boxes
Chemicals called CFCs
spray cansholes
Answer the questions1.What is the ozone?
2.What are the results of damage to the ozone layer?
Ozone is a gas which occurs 20-50km above the ground. It forms an essential protective layer around the earth.
The sun would burn us up.
We are using chemicals called CFCs which are used in fridges and spray cans and other plastic items.
3.What causes the damage to the ozone layer?
Read the third paragraph
1.What are the results of destruction of the rain forests?
2.What causes destruction of the rain forests?
Answer the questions1.What are the results of destruction of the
rain forests?
2.What causes destruction of the rain forests?
• It is making the Greenhouse Effect worse because trees take in CO2.• It causes erosion of the soil and flooding.• It destroys people and animals who make the forests their home.
Human’s bad habit of burning and cutting down trees.
BAD HABITS OF HUMAN
Human’s bad habits of burning and cutting down trees Cause the destruction of the rain forests 。
BAD HABITS
• Our habit of using things once and then throwing them away creates massive mountains of rubbish.
384400km
That’s the distance from the earth to the moon.
How can we save the earth?
•We should be the green consumers!
Green food!
Companies have certificates
Cars that don’t
use petrol
Consolidation• The greenhouse effect 1.atmosphere, around, act like, glass, let …in,
while, keep…from, get out. without, earth, as…as , cold and lifeless surface , moon 2.trouble, change, because, pollute with
chemicals. Produce, CO2, by, burn fuels keep in , too much, heat 3.cause, sea, rise, drown , cities ,whole countries
Consolidation
• Damage to the ozone layer
1. ozone, gas, occur, 20-50km, above.
form, protective layer. Without, burn …up.
2.make, holes, in, mainly, by, chemicals, CFCs.
use, in, fridges, spray cans, plastic items
Consolidation
• Destruction of the rain forests
1.burn, cut down, make…worse, because, trees , take in.
2.cause, erosion, soil, flooding, as well as, destroy , make……home
Homework
•Group work 1.find out the bad habits in your
house. 2.make a plan about how to
save the earth!