Answer:
It's usually found dried, but often kept slicker. Above another need, it's said to be thicker. What is it?
What measures out time. Until in time all is smashed to it?
What is long and slim, works in light. Has but one eye, and an awful bite?
What do you throw out to use and take in when you're done?
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
What always comes into the house through the keyhole?