Answer:
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.
The more you take, the more you leave behind.
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
What goes through the door without pinching itself? What sits on the stove without burning itself? What sits on the table and is not ashamed?
What is so fragile that saying its name breaks it?