Answer:
What is the edge of earth and bread?
I am a mother from a family of eight. I spin around all day despite my weight. Had a ninth sibling before founding out it was fake. What am I?
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
You can never eat me for breakfast or lunch. What am I?
I had a bright start, but I couldn't take the pressure. I consume everything, yet I don't eat anything. What am I?
No matter how little or how much you use me, you change me every month.