Good Riddles

Question: Who eats and eats and eat people

Question: I am longer than trees I am longer than earth ...but lower than grass What am I?

Question: There was once three trees. The first tree did whatever the third tree did, and the third tree did what ever the second one does. What happens if tree number two gets cut down?

Question: I fly and never rest. What am I?

Question: I have keys but no lock, you can enter but not leave what am I?