Answer:
In marble halls as white as milk, lined with a skin as soft as silk. Within a fountain crystal-clear. A golden apple doth appear. No doors there are to this stronghold, yet thieves break in and steal the gold.
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
What is put on a table, cut, but never eaten?
What is red and nailed to a wall?
An iron horse with a flaxen tail. The faster the horse runs, the shorter his tail becomes.
If a rooster lays an egg on the exact peak of a barn, which side does it fall?