Answer:
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
So cold damp and dark I am. To stay you would refrain yet those who occupy me do never complain.
I am all around, yet to me you are half blind. Sunlight makes me invisible and difficult to find. What am I?
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down, but should not be forgotten. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?