Answer:
I am the beginning of eternity the end of time and space the beginning of every end the end of every place.
I go up when the rain comes down
I break down buildings, I crumble mountains but you can't see me. What am I?
What do you call a pig that is no fun to be around?
Though it be cold, I wear no clothes. The frost and snow I never fear. I value neither shoes nor hose and yet I wander far and near. What am I?
No matter how little or how much you use me, you change me every month.