Answer:
The distance from the top of your head to the floor standing up straight.
What does a stone become when in the water?
What calls for help, when written in capital letters, is the same forwards, backwards and upside down?
What devours all and can kill a king. Destroy a town and crushes mountains down?
Each morning I appear to lie at your feet, all day I follow no matter how fast you run. Yet I nearly perish in the midday sun.
I am a room that has a roof but no walls. What am I?