Answer:
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
The more of me there is the less you see.
I am so delicate that even mentioning me breaks me. What am I?
I get paid to shoot people then blow them up.
I fly yet I have no wings. I cry yet I have no eyes. Darkness follows me. Lower light I never see.
No matter how little or how much you use me, you change me every month.