Answer:
By Moon or by Sun I shall be found. Yet I am undone if there's no light around.
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
What can you lose that will cause other people to lose theirs too?
I go around in circles, but always straight ahead. Never complain, no matter where I am led. What am I?
I have a hundred legs, but cannot stand. I have a long neck, but no head. I cannot see, and I'm neat and tidy, as can be. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.