What Am I Riddles

Question: Round like a apple deep like a cup yet all the kings horses can’t pull it up.

Question: When people cut me, I do not bleed. They use me, but then they leave. I die, but then revive. I change my appearance as time goes by. What am I?

Question: What's yours but people use it more then you?

Question: What's wet and dry Takes you low Moves real fast And kills you slow ?

Question: What devours everything from birds, to tree, bats, and bees? Surrounds you wherever you are, and is always moving?