Answer:
I go around a yard but does not move.
I come without being fetched at night, hide away as soon as daylight strikes. Although I may look small, I am much mightier than what you can imagine. What am I?
I help engines spin and pants stay up.
No matter how little or how much you use me, you change me every month.
I row quickly with four oars, but never come out from under my own roof. What am I?
What made Cyclops quit teaching?