Answer:
What instrument can make any sound and be heard but not touched or seen?
Before Mount Everest was discovered, what was the highest mountain on Earth?
Usually green but can be brown. It's a great place to play or lie down. What is it?
I can be as thin as a picture frame but my insides have many things you can see.
I go around in circles, But always straight ahead Never complain, No matter where I am led.
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?