Answer:
What makes a loud noise when changing its jacket, becomes larger but weighs less?
Goes over all the hills and hollows. Bites hard, but never swallows.
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
What goes up when the rain comes down?
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?