Logic Riddles

Question: You have lost your mother at the carnival. You search for her and eventually you see her.

What's the first thing you do when you see her?

Question: A person was born in 1940. Today is his 18th birthday.

How is that possible?

Question: There are 31 horses on a cliff, first they jump into the air, then they come down and stop, then they stand still.

Why do they do this?

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

Question: No matter how much rain comes down on it it won't get any wetter.

What is it?