What Am I Riddles

Question: If a man carried my burden, he'd break his back.
I am not rich, but I always leave silver in my track.

What am I?

Question: I have roots that nobody sees,
I'm taller than any trees,
up and up I go,
but I never grow?

What am I?

Question: To look cool wrap me around your head.
Remove a letter and eat me instead.

What am I?

Question: When you bend me I'm kind
But I'm very hard to find
I'm easily sold
and rhyme with this when told

What am I?

Question: I break down buildings I crumble mountains You can't see me What am I?