Answer:
I climb higher as I get hotter. I can never escape from my crystal cage.
I give light by night, but not by day. I am wicked but not evil in any way. Wax for the most but always wane; except when I'm out, I stay the same. What am I?
The more of me there is the less you see.
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
I have a straight back and sharp teeth to cut objects.
What goes up the hill and down the hill, And spite of all, yet stand still?