By volume, Earth’s atmosphere (or air) contains about …% of Nitrogen and …..% of Oxygen.
a) 78.1, 21
b) 21, 78.3
c) 70, 25
d) 25, 70
Without…………………...there would be no clouds or rainfall.
a) Water vapor
b) CO
c) CO2
d) O3
The…force of the earth holds the atmosphere around it.
a) Magnetic
b) Centrifugal
c) Gravitational
d) None of these
Which of the following gas of atmosphere is inhaled during respiration that cleans the blood?
a) Carbon dioxide
b) Argon
c) Hydrogen
d) Oxygen
The third important gas of atmosphere is……..
a) Carbon dioxide
b) Argon
c) Hydrogen
d) Oxygen
Plants prepare their food in the presence of…..
a) Carbon dioxide
b) Argon
c) Hydrogen
d) Oxygen
