Answer:
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
I am bought by the yard but worn by the foot. What am I?
I hide but my head is outside. What am I?
I'm a god a planet and a measurer of heat. Who am I?
I tremble at each breath of air and yet can heaviest burdens bear.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.