Answer:
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
Vikings use this for warmth.
When the day after tomorrow is yesterday. Today will be as far from Wednesday. As today was from Wednesday. When the day before yesterday was tomorrow. What is the day after this day?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.