Answer:
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
As a state in the USA, I am round on both sides and high in the middle. What am I?
I am a caribbean shape that makes ships disappear
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
I grow up while growing down
Give it food and it will live, give it water and it will die.