>>19713724the water does not sit on the surface, it is part of the Earth. it is encapsulated by several miles of gases - this is called the “atmosphere.” Those gases put downward pressure on the surface. The ground, water, and air /are/ the planet.
Regarding “the curve,” air refraction bends light so everything looks straight as it bends. This is because the air through which the light passes curves in the same way the ground does.
tl;dr: you are a brainlet
