Logic riddles for kids with simple answers

Who makes it, has no need of it. Who buyes it, has no use for it Who uses it can neither.

What has four legs, but can't walk?

You can see me in water, but I never get wet. What am I?

What always comes into a house through the keyhole?

What happens when you throw a blue rock into the yellow sea?

I eat other animals. I have a big mouth. I am green. I live in the water. Who am I?

Thirty white horses on a red hill. First they champ, Then they stamp, Then they stand still. Who are they?

When you have me, you feel like sharing me. But, if you do share me, you don't have me. What am i?

It can fill a room without occupying space. What is that?

What can go up a chimney down but not down a chimney up?