Answer:
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
The dirtier I get, the whiter I am. What am I?
What has to be broken before you can use it?
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
I am the kind of a tree that is carried in your hand. What am I?
A little house full of meat, no door to go in and eat.