Answer:
I tremble at each breath of air, and yet can heaviest burdens bear. What am I?
I row quickly with four oars but never comes out from under my own roof.
I help engines spin and pants stay up
Some try to hide some try to cheat. But time will show we always will meet. Try as you might to guess my name. I promise you'll know when you I do claim.
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
No matter how little or how much you use me, you change me every month.