Well, most scientists don't have to answer in short little sentences.  Most of my education was spent reading books, listening to experts/teachers lecture, and it also involved a LOT of visual back up aids like videos, computer graphics, animation, all kinds of stuff.  If you were an expert in genetics would I ask you to explain it all in a few sentences?  Without referring to books (and there ARE flat earth books, many of them.  And FE is a visual topic perfect for youtube.  We are simply pointing you to the evidence.   I thought science was all about diagrams, charts, pictures, data analysis, photographs...  

Nevertheless, I will try my best.  I have only been studying FE for 7 months. How can earth "stay flat" despite gravitational influence always rounding it off?  lol!!  Gravity is "proven" through correlation of data.  Correlation isn't causation.  So, you question of course assumes gravity is proven and is causal. I know you will dismiss that answer, but that is my answer.