Arrange the following gases in descending order of their share in the composition of the atmosphere.
A. Carbon dioxide
B. Hydrogen
C. Argon
D. Helium
Choose the correct answer from the options given below:

Correct option is A

 
The correct order of the gases in descending order of their share in the atmosphere is:
· C. Argon: Argon makes up about 0.93% of the Earth's atmosphere, making it the third most abundant gas.
· A. Carbon dioxide: Carbon dioxide accounts for approximately 0.04% of the atmosphere.
· D. Helium: Helium is a trace gas, constituting around 0.0005% of the atmosphere.
· B. Hydrogen: Hydrogen is present in the atmosphere in very small amounts, around 0.00005%.