Answer:
I am easy to waste and unstoppable
If a man carries my burden they will get crushed to death. Though not rich I leave silver in my track.
You throw me out when you use me and take me in when you are done. What am I?
I am milky white and scares people.
I reach for the sky, but clutch to the ground. Sometimes I leave, but I am always around. What am I?
Give it food and it will live, give it water and it will die.