Question

air contains:
a)water vapour
b)oxygen
c)dust and smoke
d)all of these

Air is made up of :
a)three gases
b)one gas
c) several gases
d)none of these

Main causes of air pollution are:
a)vehicles releasing smoke
b)excessive burning of fuels
c)burning of wood
d)all of these

Gas with the highest percentage in air is:
a) Nitrogen
b)oxygen
c)water vapour
d)carbon dioxide

Air contains _% of carbon dioxide
a)30.00
b)0.030
c)3.000
d)0.003
pls answer correctly ​

Answer 1

Answer:

1) b

2)c

3)d

4)a

I am not sure about last one

Answer 2

Answer:

air contains all of these .1

Explanation:

air is made up of several gases .2

main cause of pollution is all of these .3

gas with highest percentage is nitrogen .4

air contains 0.003 carbon di oxide .5