What is ozone?
Which gas is mentioned as the main component of the ozone layer?
When did we find out about the hole in the ozone layer?
Why is the ozone layer important?
In which year did many countries stop using some harmful chemicals affecting the ozone layer?
What event did scientists discover in the ozone layer in the 1980s?
What is the ozone layer compared to in the text?
What do yo know about the hole in the ozone layer?
I know that the hole in the ozone layer is over the Antarctic
In the 1980s
Ozone is a gas
Large hole
1987
A blanket
Ozone (O3)
It filters out the harmful rays of the sun