The Elementals

Here is your riddle: I am greater than god. I am more evil than the devil. The poor have me The rich need me And death comes to those who eat me. Who am I? *** I am ever hungry And live if you feed me. I am never thirsty And die if you quench me. What am I? *** I see much but change little. I am firm irresolute Powerful but gentle; I have enough strength to rip apart mountains Yet be moved by gentle stirrings I am life itself And I give life to others. Who am I? I'm a five letter word that has no end One through three can amend One four and five are something alive Two and three occur near thee. What am I? *** I am light as a feather Yet no man can hold me for long. My presence causes life My absence death. *** I welcome the day with a show of light I steathily came here in the night. I bathe the earthy stuff at dawn But by the noon alas! I'm gone. *** The last but not the least little one: Lighter than what I am made of More of me is hidden than is seen I am the bane of the mariner A tooth within the sea. Speak my name.