Answer:
I save lives on the ground and in the air. What am I?
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
I break down buildings, I crumble mountains but you can't see me. What am I?
What has roots that nobody sees and is taller than trees. Up up up it goes and yet never grows?
I am a band that does not perform, sing, or act. What am I?