What Am I Riddles

Question: I had a chance to be alive, but I am dead. I am white but some times brown. And most times when I open I feel like I'm burning as I face the sun.

Question: Eight of us go fourth, not back, to protect our king from an attack. What are we?

Question: It dies when it's hot, exists when it's cold, you can touch it, but you cannot bounce it, and it doesn't give you any gold. What am I?

Question: At the end of a long dark cave there is a monster made of lead. Be careful. One twitch of the finger and you will release it.

What is it?

Question: What is bright and sunny?