Question

What if the earth was flat

Answer 1

If the Earth were flat, then ...

-- the sun would never rise;

-- the sun would never set;

-- the sun would look larger and smaller at different times of day;

-- you would be able to see Mt. McKinley, Mt. Everest, Mt. Pinatubo,
and Mt. Kilimanjaro, all from your front yard or your bedroom window;

-- in fact, when the air is clear, you would be able to see the Sears Tower
(here in Chicago) from your front yard or your bedroom window;

-- the shadow of the Earth, falling across the moon, would be some times
circular, some times elliptical, and some times straight, instead of always
circular every time;

-- when you're on the beach, watching a ship sail away from you,
it would just get smaller and smaller and smaller as it got farther
and farther and farther from you; you would never see any of it
disappear, instead of seeing it disappear from the bottom up
the way it actually does.

Lots and lots of other things would also look different and happen
different from the way they actually do look and happen now.

Answer 2

Then everyone would fall off the surface