Answer:
I climb higher as I get hotter. I can never escape from my crystal cage.
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
What has feet and legs, and nothing else?
I can wake you up in the morning but I require no electricity or winding. What am I?
I can be sweet or sour. I do not rhyme with any other word
No matter how little or how much you use me, you change me every month.