Answer:
Q 20: I think this answer would be rarer to denser medium
Q 21: The fluctuation of physical condition in the Earth's atmosphere.
Q 22: I don't see white as an option, but I'm pretty sure that's the correct answer.
Windy with precipitation because it shows that the wind speeds keep increasing
<span>Hey :)
Add coefficients in front of the products and/or reactants to get the same amount of particles on both side</span>