Atmoshphere

Question 0

Which layer of atmosphere is like a shield?

What does it protect the earth from?

Answer 0

Stratosphere

From the suns dangerous rays.

Question 1

List the layers of the atmosphere in order from the closest to the earth to the most outer layer

Answer 1

Troposphere
Ozone layer
Stratosphere
Mesosphere
Ionosphere

Question 2

Which layer is the coldest?

Answer 2

Mesosphere

-100deg

Question 3

What does the mesosphere do for us?

Answer 3

It protects the earth from rocks (meteors) and dust that fly into the atmosphere from space.

Question 4

The ionosphere …………. The dangerous ………….. From the sun.

Answer 4

Absorbs, rays

Question 5

………… ………….. 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

Answer 5

Radio waves, different

Question 6

How are radio and tv programs transmitted around the world? 4marks

Answer 6

• 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

Question 7

The troposphere has all the …….. We need for …………

Answer 7

Air, breathing

Question 8

All ……….. And ………… Live in the troposphere

Answer 8

Animals, plants

Question 9

The troposphere has ………. And ……….. And this is where we find different kinds of ………..

Answer 9

Water vapor, clouds, weather

Question 10

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 ………

Answer 10

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.

Question 11

Name 4 facts about air

Answer 11

• 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

Question 12

What do we say if the air is dirty? 1

Answer 12

It is polluted

Question 13

List 5 things on paper that make our air dirty. Then check your answer against the brainscape answer.

Answer 13

• 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

Question 14

How are poisonous gases formed? 1
What characteristics do the gases have? 2
Why is it dangerous? 1

Answer 14

• 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

Question 15

List the 4 parts that make up the planet earth. 4

Answer 15

• Inner core
• outer core
• mantle
• crust

Question 16

Give 4 facts about the inner core.

Answer 16

Check your answer in your notes on activity 6 pg 44

Question 17

Give 4 facts about the earths outer core.

Answer 17

Check your answer in your notes on activity 6 pg 44

Question 18

Give 4 facts about the earths mantle

Answer 18

Check your answer against the notes on activity 6 pg45

Question 19

Give 4 facts about the earths crust

Answer 19

Check your answer against your notes on activity 6 pg 45