Answer:
If you have it, you want to share it. If you share it, you don't have it.
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
It floats over the land, It cuts the tallest mountain, Its voice is like a fountain, Its body like a snake, Will flow into a lake.
So cold, damp and dark this place. To stay you would refrain, yet those who occupy this place do never complain.
What word is a plural, but when you add an "S" to the end, it becomes singular?
What never gets any wetter no matter how hard it rains?