Answer:
Where jewelry pierces your head.
I'm a god, a planet, and measurer of heat. Who am I?
Lots of them make up a word, And lots of words are in them. It's easy when you think about it. A while ago we stamped and mailed them.
I call the trees my home, yet I never go inside, and if I ever fall off the tree I will be surely be dead.
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
Break me and I am better immediately set and harder to be broken again.