I have a narrative story that i submitted for Florida Virtual School if you want it you're going to have to change some words one is about a jellyfish and the other is about a girl who got stuck in an airport.
If you want it just tell me and i will edit this answer and put a link
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Gravity. It is based on mass, more mass = more gravitational attraction
I'm not exactly sure how to answer that for you, but you can use the attached file to pin-point what you are looking for.