What Am I Riddles

Question: What always murmurs but never talks, Always runs but never walks, Has a bed but never sleeps, Has a mouth but never speaks

Question: What has a lot to say but can't be heard because it can't speak one single word?

Question: To many, I am life's source. I am also its most valuable resource. I create and burn my own precious element, and my destruction will be my punishment. What am I?

Question: Turn us on our backs and open up our stomachs You will be the wisest. What am I?

Question: I shoot people and sometimes cut off their heads. What am I?