Answer:
People need me yet they give me away every day.
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
I shift around though always slowly. I never move more than a few inches at a time. A large movement by me can kill many people. I am huge yet unseen by humans.
I don’t forget!
What do you call a bear with no teeth?
How did the phone propose to his girlfriend on Valentine's Day?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic