Funny riddles

Why is a river rich?

Why do Chinese men eat more rice than Japanese men do?

If you had three apples and four oranges in one hand and four apples and three oranges in the other hand, what would you have?

A horse is on a 24 foot chain and wants an apple that is 26 feet away. How can the horse get to the apple?

What room do ghosts avoid?

What do you get when you drop a pumpkin?

If it takes one man three days to dig a hole, how long does it take two men to dig half a hole?

What bird can write?

What kind of dog has a bark but no bite?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test it was a blank sheet of paper with a solitary question on it: "What is risk?" Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word! What did he write?