Which layer of atmosphere is like a shield?
What does it protect the earth from?
Stratosphere
From the suns dangerous rays.
List the layers of the atmosphere in order from the closest to the earth to the most outer layer
Troposphere Ozone layer Stratosphere Mesosphere Ionosphere
Which layer is the coldest?
Mesosphere
-100deg
What does the mesosphere do for us?
It protects the earth from rocks (meteors) and dust that fly into the atmosphere from space.
The ionosphere …………. The dangerous ………….. From the sun.
Absorbs, rays
………… ………….. Coming from earth reach the ionosphere and are bounced back to a ………… Part of the earth where they are picked up by people’s tvs and radios
Radio waves, different
How are radio and tv programs transmitted around the world? 4marks
- Radio waves coming from earth
- Are bounced back by the
- Ionosphere
- To a different part of the earth where they are picked up by tvs and radios
The troposphere has all the …….. We need for …………
Air, breathing
All ……….. And ………… Live in the troposphere
Animals, plants
The troposphere has ………. And ……….. And this is where we find different kinds of ………..
Water vapor, clouds, weather
T or F:
There are more gases the closer you are to earth ………
Half the atmosphere is below the 10km level above sea level ……..
There is atmosphere in space……..
Air is renewed all the time ………
T
F, 5km
F, there is no atmosphere in space
F, the same air is used over and over because it is the only air we have.
Name 4 facts about air
- The air is the only air we have and we use it over and over again
- we breathe the same air as our cats and dogs do and the same air as our ancestors and dinosaurs breathed
- the air we breathe is the same air that is passed through our motor car engines and factories chimneys.
- we can’t get any more from anywhere else
What do we say if the air is dirty? 1
It is polluted
List 5 things on paper that make our air dirty. Then check your answer against the brainscape answer.
- where we burn fossil fuels like coal and oil in power stations
- when we make things that require burning and heating in factories
- when we drive cars which give off fumes
- when we burn rubbish
- when we burn grass, bush veld and trees
How are poisonous gases formed? 1
What characteristics do the gases have? 2
Why is it dangerous? 1
- Strong sunlight interacts with the exhaust fumes from motor vehicles.
- sometimes you can see and smell the gases. They have a brownish colour and is called smog.
- smog is dangerous to plants and animals
List the 4 parts that make up the planet earth. 4
- Inner core
- outer core
- mantle
- crust
Give 4 facts about the inner core.
Check your answer in your notes on activity 6 pg 44
Give 4 facts about the earths outer core.
Check your answer in your notes on activity 6 pg 44
Give 4 facts about the earths mantle
Check your answer against the notes on activity 6 pg45
Give 4 facts about the earths crust
Check your answer against your notes on activity 6 pg 45
