Answer:
I am seen in the water. If seen in the sky, I am in the rainbow, a jay's feather, and lapis lazuli.
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
What is it that has four legs, one head, and a foot?
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
What comes once in a minute, twice in a moment, but never in a thousand years?
People take me on walks and I run and have fun. What am I?