Answer:
I’m hard as a rock and as light as a feather. I’m passed on to one another. Poor people need me and rich people have me.
Angels and pilots work with me.
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?
I smell like blue paint pours like green paint and I look like a red truck.
No matter how little or how much you use me, you change me every month.