Answer:
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
Vikings use this for warmth.
A house of wood in a hidden place. Built without nails or glue. High above the earthen ground It holds pale gems of blue.
I tremble at each breath of air, and yet can heaviest burdens bear.
What can burn the eyes, sting the mouth, yet be consumed?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?