The atmosphere of earth is an example of a solution.
a. liquid-liquid
b. gas-liquid
c. gas-gas
d. solid-liquid

I think the correct answer from the choices listed above is option C. The atmosphere of Earth is an example of a gas-gas solution. The atmosphere is a mixture of different gases where oxygen is the most abundant substance. Hope this answers the question.

Ifound this on google “these two compounds have a different ionic structure. caesium ion is larger in size when compared to the sodium ion. the charge gets more area to spread out evenly. so caesium chloride has a lower melting point than sodium chloride.” i hope this you for what your looking for