Good Riddles

Question: You have bag, you put a lump of metal into the bag, then you put a lama into the bag, then you put something else into the bag, and yet the bag weighs nothing. Why?

Question: Of the god’s own sorrow and tears i can create life. Then i provide my creation with fire to allow for growth and prosperity. But the vengeance of the gods is due and I will surely fall. In the coldness of the night, the life I created only finds death. what am i?

Question: If 1+9+8=1, what is 2+8+9?

Question: A wise man once called me "the moist star", and in an infinite sea, I can be seen afar. I create motions in which you may ride on for sport, and am also used as a scientist's port. What am I?

Question: What four related words are merged together: TOUS RGQC URRO IAAN RLGS EEET ENE