Answer:
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
I am a protector of the scoreboard.
My first is in window but not in pane. My second's in road but not in lane. My third is in oval but not in round. My fourth is in hearing but not in sound. My whole is known as a sign of peace. And from noah's ark won quick release.
I can be in your body but never on your placemat. I'm always better when I'm fresh, but you'll never see me in the flesh. What am I?
You use me from your head to your toes. The more I work, the thinner I grow. What am I?
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.