Answer:
Without me everyone would lose their head. What am I?
What can travel around the world while staying in a corner?
I reach for the sky but clutch to the ground. Sometimes I leave but I am always around.
I come without being fetched at night hides away as soon as daylight strikes. Although I may look small I am much mightier than what you can imagine.
What can you catch but not throw?
Written on with words of white, Has the color of the night, Is the teacher's best delight, And a student's daily fright