Funny Riddles

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: If you aim to give us a shot, we'll riddle you.

What are we?

Question: Scientists are trying to figure out what is between Heaven and Earth.What is it?

Question: Which comes first, chicken or egg?

Question: How many seconds are in a year?