What Am I Riddles

Question: i am boiling hot and freezing col at the same time what am i?

Question: I look green but I am not. I look blue but I am not. I look red but I am not. What am I?

Question: What is something of which there are multiple, but you can't make full a list of, while you can make a list of the worst ones.

Question: What can you put in your mouth, but not swallow?

Question: Every dawn begins with me At dusk I'll be the first you see And daybreak wouldn't come without What midday centers all about Daisies grow from me I'm told And when I come I end all cold But in the sun I won't be found Yet still each day I'll be around What am I?