Answer:
What is yours but only used by others?
They made me a mouth, but didn't give me breath. Water gives me life, but the sun brings me death.
It moves around in circles. We see it as we turn. It keeps us always warm. Always alive and always dying, Across the sky we see it flying, But touch it and we burn.
What speeds on a track but isn't in a race and has a whistle to announce its steady pace?
What kind of room has no doors or windows?
I am the same written forward backward and upside down.