Short Riddles and Answers

Question: I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter.

What am I?

Question: Filled with garb,
the price is free.
Just return what you don't need.

What am I?

Question: I do good things, but one small push could be a horrid disaster! I am normally used for decoration now.

Question: I have no bed to sleep or no palace to live. I don't have a single coin then also I am known as king.

Question: What arrives at the end and can occur several times a day, once every month, or last millions of years?