Answer:
In the night a mountain, in the morning a meadow.
A precious fluid, thicker than water.
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face.
I'm white, I'm round, but not always around. Sometimes you see me, sometimes you don't.
Many have heard it, but nobody has ever seen it. It will not speak until spoken to. What is it?
What language does a billboard speak?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?