Guess me ; I hold up the sky; I hold many pounds. Just so you know, I can never fall on the *ground*. I am made.........

Question

I hold up the sky; I hold many pounds. Just so you know, I can never fall on the *ground*. I am made of the world; without me you'll die. The ones who survive are the ones that can fly. What am I?

Answer 1

RESULT: The ground.