What Am I Riddles

Question: I can be half without getting thinner.
I can shine with no fire.
I can be hidden but never taken.
I can stay dry while moving the ocean.

What am I?

Question: We hurt without moving. We poison without touching. We bear the truth and the lies. We are not to be judged by our size.What are we?

Question: I can be dropped from the tallest of buildings and survive,but drop me from the smallest ship and I won't.What am I?

Question: I'm written with two letters, said with one and seen with two.What am I?

Question: What type of cheese is made backwards?