I am heavy forward, but backward I’m not. What am I?

Answer: Ton

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I am hewn from Earth and Fire; But to the sky, I aspire. I am nothing but contented; Until my patient rage is vented. What am I?
I am hot then cold, a liquid then solid, and I am at once flaky and wet. What am I?
I am hot, sometimes soft, sometimes hard, sometimes runny and loose, sometimes I float, sometimes I sink but whatever form I take on I always go out and never in. What am I?
I am hot. I am hidden. I am cold. I am hard. I am sharp. I am soft. I am still. I am moving. I am above. I am below. I am two and one. Always changing. Always the same. What am I?
I am in heaven but not in hell. I’m in the devil but not in god. I’m in the river but not in the sea. What am I?
I am in the past, never in the future. I don’t exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
I am in the sky. I'm white, I'm round, but not always. Sometimes you see me, sometimes you don't. What am I?
I am known for my natural tuxedo and marching. What am I ?
I am known to be bad luck when you see me in the dark and oh how I hate the rain but one thing is for sure you won’t hear me bark. What am I?
I am lighter than air but a hundred people cannot lift me. Careful, I am fragile. What am I?
I am lighter than air but a million men cannot lift me up, What am I?
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath. What am I?