Good Riddles

Question: Although I am still, in families, I run. I continue to live on in a living one. As one continues to draw breath, I will not rust. However, when one stops drawing breath, I will become mere dust. What am I?

Question: It's a question you can ask all day long and get completely different answers although these answers could be correct. What question is it?

Question: What goes round the house and in the house but never touches the house?

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

Question: I can be sun,
I can be sand,
and I can be bird.

What am i?