Answer:
A precious stone, as clear as diamond. Seek it out while the sun's near the horizon. Though you can walk on water with its power, try to keep it, and it'll vanish in an hour.
Jack and Jill when up the hill jack fell down
They try to beat me, they try in vain. And when I win, I end the pain.
Sharp and long, flag of the world. What is it?
What is lengthened by being cut at both ends?
What do angels sing in the shower?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?