Answer:
What word starts with 'E', ends with 'E', but only has one letter? It is not the letter 'E'.
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
Through its wounds, water does run. It once held many but now has none. What is it?
Break it and it is better, immediately set and harder to break again.
What is up that’s also down? What’s a smile and a frown?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?