Answer:
What can be underwater, under fire, on fire and taking water all at the same time?
Vikings use this for warmth.
I am seen in the water. If seen in the sky, I am in the rainbow, a jay's feather, and lapis lazuli.
There is one word that stands the test of time and holds fast to the center of everything. Though everyone will try at least once in their life to move around this word, but in fact, unknowingly, they use it every moment of the day. Young or old, awake or in sleep, human or animal, this word stands fast. It belongs to everyone, to all living things, but no one can master it. The word is?
What is the thing that stays the same size, but the more it's used the more it decreases?
In birth I spring forth, in life I unfold. In death I wilt and die, but rebirth restores all.