Answer:
I break down buildings, I crumble mountains but you can't see me. What am I?
I begin and have no end. Eventually I will be the end of all that has begun.
What do you get when you cross a cow with a trampoline?
I spend the day at the window go to the table for meals and hide at night.
Lighter than what I am made of. More of me is hidden than seen. What am I?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk