Kids Riddles

Question: A thousand wheels, but move I do not.
Call me what I am, call me a lot.

What am I?

Question: All things I devour: Birds, beasts, trees, flowers.
I gnaw iron, bite steel.
I grind hard stones to meal.

What am I?

Question: Who is reading this question now?

Question: What kind of mistake does a ghost make?

Question: You can rest on my pad without touching the keys.
I will sing all month long as long as you pay your fees.

What am I?