Riddle #1077

It can't be seen, can't be felt, can't be heard and can't be smelt. It lies behind stars and under hills, and empty holes it fills. It comes first and follows after, ends life and kills laughter. What is it?

You bury me when I am alive, and dig me up when I die. What am I?

Take off my skin - I won't cry, but you will! What am I?

Look at me. I can bring a smile to your face, a tear to your eye, or even a thought to your mind. But, I can't be seen. What am I?

I dig out tiny caves, and store gold and silver in them. I also build bridges of silver and make crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs my help, yet many people are afraid to let me help them. What am I?

What word in the English language does the following: the first two letters signify a male, the first three letters signify a female, the first four letters signify a great man, the first six letters signify a drug, while the entire world signifies a great woman. What is the word?

I look taller when I am young. But as I get old, I become shorter and shorter. What Am I?

I have more than 80 keys, but I cannot open any lock. What Am I?

If I drink, I die. If i eat, I am fine. What am I?

I get whiter the dirtier I get. What am I?

I travel all over the world. But I could not move, just stay in a same single spot. What Am I?