Riddle: I am cold to the touch but yet I burn if held. What am I?
Answer: I am dry ice. Dry ice is frozen, solid, carbon dioxide that freezes at −109.2F.  The extreme cold makes it dangerous to handle with bare skin.
Riddle: Three eye's have I, all in a row. When red, all freeze. What am I?
Answer: A stoplight.
Riddle: There is not wind enough to twirl That one red leaf, nearest of its clan, Which dances as often as dance it can. What is it?
Answer: The answer is “flame” (or “fire”). This riddle is related to a quote by Samuel Taylor Coleridge. The “one red leaf” is a metaphor for a tongue of flame on a low fire, which “dances” and flickers even when there isn’t enough wind to twirl an actual leaf. Coleridge’s imagery captures how a small flame closest to the embers moves restlessly with the slightest draft, appearing like a red leaf among its “clan” of other flames and coals
Riddle: A box without hinges, key or lid, Yet golden treasure inside is hid. What am I?
Answer: An egg.
Riddle: Empty as space , Scary as a ghost, I appear every night What am I?
Answer: Darkness.
Riddle: You go to the doctor because you're ill and he prescribes you with 3 pills and tells you to take them every half hour. How long do the pills last you?
Answer: An hour because the first pill doesn't take 30 min. to take.
Riddle: I am round or oval? I can be light or dark. You can cut me in pieces. What am I?
Answer: A Potato.
Riddle: What is both possible and impossible at the same time?
Answer: Impossibility.
Riddle: I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breathe on this terrestrial ball. What am I?
Answer: Tomorrow.
Riddle: What has cities, but no houses; forests, but no trees; and water, but no fish?
Answer: A map.