Fun Riddles

Question: I wasn't born a horse,
and I never fly.
Yet sometimes I still soar,
right into the sky.
I often contain breath,
and yet I never die.
Sometimes I am torn,
but I never sigh.
Often, with ambition, I aspire,
and go till I can go no higher.
Then, like many men, so great,
I sink into a low state.
What am I?

Question: Four hang, four sprang, two point the way, two to ward off dogs, one dangles after, always rather dirty.

What am I?

Question: What is the center of gravity?

Question: Round like a apple, deep like a cup, but all the kings horses can't pull it up.

What is it?

Question: What is brown or silver, has a head and tail but no arms or legs?