Answer:
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
I can be found after you remove 6 letters from BSAINXLEATNTEARS
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
I make a loud sound when I'm changing. When I do change I get bigger but weigh less. What am I?
People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?
My days are numbered.
What am I?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic