Answer:
What dress does everyone have, but no one wears?
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
What is seen in the middle of March and April that cannot be seen at the beginning or end of either month?
What has to be broken before you can use it?
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
Give it food and it will live, give it water and it will die.