Quote Originally Posted by Gizmokid2005 View Post

It trembles at each breath of air
And yet can heaviest burdens bear
It shows no mark when it is hit
And more - you're mostly made of it!
What am I?
ANSWER (Congrats TL): Water.

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NEXT RIDDLE:

I'm tall when I'm young,
Short when I'm old,
with light I do glow,
breath is my foe.

What am I?